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I believe Takeshi gave the kentarosu to Satoshi b/c he was catching them with him, and you can assume when they transferred them back to Ookido-hakase, Takeshi probably had no use for it anyway...
They were never his to begin with. He simply helped Satoshi hurl the Safari Balls at the Kentauros. No way Satoshi would've been able to catch so many by himself.
Yea i agree... But why he help get kentauros? he should get some thing more decent like saihorns. I remember he wanna catch a saihorn, but turn out to catch kentauros...
Simply cause they were the easiest, yet tough looking to catch. Chances are Satoshi figured "The hell with it" and caught more Kentauros. They proved usefull quite later on. :P