Welcome to the river, this is a good opportunity to go back through stages and re-do them for better pokemon pics, anyway you start out in the river and to your right is a lone poliwag, throw a pester ball close to it but don't hit it, and it will run to another poliwag, do the same but wait for a minute look to your left (push the C<- button) and hit the bulbasaur on top of the log to get him out, lure him to the open log with apples, another bulbasaur will pop out [o], turn right (C->) and throw a pester ball at them, they will run down to the river and jump in [o], well move on and you'll see a slowpoke throw apples onto the round spot of dirt, slowpoke will fish [o], you'll see some shellder to your right[o], slowpoke will evolve into slobro[o] and move on, (to the right of slowpoke there is a vileplume asleep if u don't have the pokeflute yet don't worry, you'll be back later) go through and u will see a few metapod hanging from the roof [o], now look to your left and u will see a psyduck wandering around [o], if you took some shellder photos before you may see a cloyster flying in the air then disappearing into the water if not DO IT AGAIN!!!!, look to your right just after the metapod and you will see 2 lumps sticking out of the wall, well hit them with a pester ball duh, and porygon will come out, hit them again and they will show their true colors, moving on you will see a switch, and above it a lump, well what r u waiting for hit the thing and you will finish the level and move on to the
cave, alternatively you can also go past the pikachu on the log [o] and he will run out as speed pikachu [o], and pass through the gate to finish the level.