There is a massive outbreak of Grimer in the underground waterworks. The Grimer cannot be allowed to roam free. Capture them all!
Back at Fall City's Ranger Base[edit]
Joel promotes you to Ranger Rank 3 for doing an excellent job with your mission in becalming the Machoke and helping the Fall City citizens! With this, you can use the Poison Poké Assist, the Psychic Poké Assist, and lastly, you'll unlock a second bar to your Partner Gauge, meaning you can now use a more powerful assist with it. Joel also tells you that you can add more bars at Ranger Ranks 5, 7 and 9.
Just after you rank up, a civil engineer runs in pushing you to the side, as he reports that the sewers, which are supposed to be clean, are full of sludge! It's infested with Grimer and he wants a Ranger to investigate. Joel says that all his Rangers are tied up so he assigns you the mission to go and capture the Grimer and then deliver them to an expert Ranger that can deal with them.
Grimer Outbreak[edit]
Your next mission has started, so head out of the Ranger Base and go the same way you went to the lab which is just up the stairs next to the Ranger Base. Go past the lab, and down at the intersection to find the waterworks entrance. Before you can delve deep into the Waterworks, you meet up with a Fall City Ranger who will take the Grimer that you capture. After talking to the Ranger go down to find a Totodile.
| Pokémon | Field Move | Poké Assist | Loops |
|---|---|---|---|
 Totodile |  | Water | 4 |
Capture the Totodile and keep it as having a Water Poké Assist is always handy.
Before you can go on and capture anything else, you'll find some puddles of sludge, and you'll find your first Grimer.
| Pokémon | Field Move | Poké Assist | Loops |
|---|---|---|---|
 Grimer | None | Poison | 5 |
After capturing it, the sludge will be cleared, and the Ranger that was at the entrance will come running to take the Grimer with him.
Continue following the path to the right and you will get to the next area. You'll immediately a new Pokémon, Corphish
| Pokémon | Field Move | Poké Assist | Loops |
|---|---|---|---|
 Corphish | | Water | 6 |
Notice the two metal fence gates to the right, and how you arent able to clear them yet.
Head all the way down and then go right, you'll find another pair of Grimer. Capture them and continue heading to the right to find a Drowzee.
| Pokémon | Field Move | Poké Assist | Loops |
|---|---|---|---|
 Drowzee | None | Psychic | 6 |
Capture the Drowzee and keep it as you need its Poké Assist later on. Continue following the path right and go down the ladder to the next area. Go down the next ladder on the right and slide your way to the right without falling of the edges or you will go down a floor. Find a Koffing along the way.
| Pokémon | Field Move | Poké Assist | Loops |
|---|---|---|---|
 Koffing | None | Poison | 8 |
After you capture Koffing, you can release it and continue going right until you reach the other end. Go up the two ladders and you'll find a Raticate which you need to capture for its 2x 
.
| Pokémon | Field Move | Poké Assist | Loops |
|---|---|---|---|
 Raticate | | Normal | 5 |
After you capture Raticate, bring it back to where you saw the metal fences, and use Raticate's Field Move to cut down one of them down. Head up to the next screen. Along the way, you'll be jumped by a new Pokémon, Croconaw.
| Pokémon | Field Move | Poké Assist | Loops |
|---|---|---|---|
 Croconaw | | Water | 5 |
Keep heading to the right to get to the nrxt area. Continue going right and you will find another pair of Grimer, capture them and continue moving along to the next screen. You'll find two pipes, going into the one on the left will allow you to catch another Drowzee and a Corphish. Capture the Drowzee as its Poké Assist is double effective on the Grimers if you are having trouble with them. Once done, head into the pipe on the right. You'll meet with Aria, who will go on ahead with her investigations on the Go-Rock Squad. Go up and out of the pipe and then go down the stairs directly to the right. Dodge all the Koffing and make sure not to fall off the edge, and then climb the ladders on the right side of the room.
Head down the pipe on the left, save if you wish and folliw the path to the left to get to the next area. Capture the Magnemite before the bridge and use its Electric field Move if your Styler is low. Cross the bridge and walk a bit to the left to encounter a Grimer trio. Capture them and head right to capture another Drowzee if you need it. After that, head back lefg to find Aria and a small post on the other side of a waterway. You'll need to find a way to cross, so go up to find a Tangela.
| Pokémon | Field Move | Poké Assist | Loops |
|---|---|---|---|
 Tangela |  | Grass | 2 |
Bring this Tangela down to the place you need to cross and use its on the post to get to the other side. Before going any further left, go up and capture a Meditite.
| Pokémon | Field Move | Poké Assist | Loops |
|---|---|---|---|
 Meditite |  | Fighting | 4 |
After capturing the Meditite, jump down onto the side you were previously on and go right to find a breakable wall. Use Meditite's to clear it, and go inside to find not one, but two new Pokémon, Magneton and Oddish!
| Pokémon | Field Move | Poké Assist | Loops |
|---|---|---|---|
 Magneton |  | Electric | 3 |
 Oddish | | Grass | 5 |
Keep in mind that Magneton's Field Move is an improved version of that of Magnemite and Pichu, so it may be a valuable ally to you in the future.
Cross once again by finding a Tangela by going up and then use it's Field Move. Walk into the pipe to the left. Follow its linear path until you exit. In this room, you can go to the west and find a gate that requires Raticate's Field Move to clear. Thankfully, going down the pipe to the left and straight down will bring you to an area with another Raticate, so capture it and bring it back to that gate to clear it. If you do, you'll find another new Pokémon behind it, Crawdaunt!
| Pokémon | Field Move | Poké Assist | Loops |
|---|---|---|---|
 Crawdaunt | | Water | 10 |
After capturing it, head back into the left pipe, and this time go to the left branching path and then down to get out of the pipe. Capture another trio of Grimer and head on through the area. You'll see a civil engineer getting attacked by two Grimer and a Muk. Head towards him and along the way you will find another Drowzee, capture it then continue to the engineer and capture all three of the Pokémon in your next boss battle!
| Pokémon | Field Move | Poké Assist | Loops |
|---|---|---|---|
 Muk | None | Poison | 10 |
This battle is made quite difficult by the fact that both Grimer and Muk leave poisonous tracks on the ground as they move, which hurt if you draw a line into them. To give you an easier time on this fight, you can capture the Drowzee that appears a bit before this battle and use its Assist, as the Psychic Assist levitates the Pokémon in the air for a little while allowing for a much easier capture. Otherwise you can also attempt to use your partner's Assist to paralyze them all, but if you do make sure they are together as it may be difficult to draw loops around them if they are not.
Once you've captured all three, it'll be...
Mission clear!