This is what I did, After I beat Stormy sea, I went to Pokemon Square and then a Spinda apears, then he faints, Meanwhile Me and my partner were in the Rescuebase with the Spinda then he gives you a Clear Feather which allows you to go to Fiery Field where you Battle Entei, Then Lighting Field where you battle Raikou, and Northwind Field where you battle Suicune, or If you bought the Friend Area "SouthernIsland" then go through Solar Cave and then you will see Latios talking to a Kecleon and Then you have to Rescue Latias,(I forget where but a place might open when you see Latios)After that then Latios and Latias will thank you for helping Latias and they will both ask to join you team! P.S: Places and Friend Areas are in Italics and Pokemon are in Bold
Waterfall pond on floors 6 thru 12 the hm Waterfall is needed to enter the dungeon
You can recruit water Pokemon like squirtle and totodile in waterfall pond and stormy sea after you beat rayquyaza
In Pokemon Mystery blue Dungeon, after you beat Rayquaza, you should be able to go to a dungeon called solar cave. There you will find the HMS surf, dive, and waterfall. In sublevels 10-20 you should find a few Chimechos. I have one Chimecho
Once you have completed the game, talk to Lombre and Shiftry. Otherwise I don't know.
you usually find totodile in wyvern hill and waterfall pond ( you need a Pokemon that knows waterfall or you have the hm waterfall in your tool box to access waterfall pond), its friend area is rub a dub river. At level 18 it evolves into crocanaw, at level 30 it evolves into feraligatr
you can find him in waterfall pond with HM dive or waterfall.
feebas can be found in the dungeon called ''waterfall pond.
There are 8 floors in Waterfall Cave.
Waterfall pond on floors 6 thru 12 the hm Waterfall is needed to enter the dungeon
Waterfall Pond has 19 floors. You need the HM Waterfall to enter the cave.
wyvern hill 6f-11f waterfall pond 6f-10f (source serebii.net)
In mystery dungeon Red/Blue, you can recruit it at Waterfall Pond, but first you need to obtain HM Waterfall from Solar Cave. Then, once you recruited it, at its friend area, choose become leader.
after you have completed the game you can make any Pokemon leader
you need it for waterfall pond or whatever its called
You can recruit water Pokemon like squirtle and totodile in waterfall pond and stormy sea after you beat rayquyaza
In Pokemon Mystery blue Dungeon, after you beat Rayquaza, you should be able to go to a dungeon called solar cave. There you will find the HMS surf, dive, and waterfall. In sublevels 10-20 you should find a few Chimechos. I have one Chimecho
Waterfall cave is unlocked when you progress through the main story. I forgot exactly when becuase I found it a long time ago. Sorry. This is all I remember.