Question

He is asking for a round blue pokemon with leaves growing on it's head. I tried a Jumpluff and it's not that. I can't see any others that would fit.

Also, what other pokemon does he ask for later?

Answer 1

ODDISH!!!

EDIT: Sorry, didn't read whole Question, He Asks for just about anything that evolves by a stone, and he'll give you the stone for it(except Lickatung, he gives an everstone 4 that). So If you get stuck, find a pokemon that fits his description, and evolves by a stone:)

Comments

ODDISH ISN'T BLUE! The old guy is colorblind :)

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Actually, Oddish IS Blue:)

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Well I guess I must be colourblind since it looks black to me!

Answer 2

OK thanks to Swampert for the info. For future reference, here are the rest I was asked for and the correct pokemon:

"A fire type pokemon that's supposed to roar well."
Growlithe

"A pokemon with large round eyes. The one that sings a lullaby with it's cute voice!"
Jigglypuff

"A hugely popular pokemon that has a yellow body and bright red cheeks. I would love to see what it looks like before it evolves."
Pichu

"Blue and round, end of its tail works like a float. Its belly is white."
Marill

Comments

The last one is pikachu cause pichu evolve by friendship just sayin

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No it's not, it's Pichu. He's asking for Pikachu's pre-evolution.