[If you've been here for a long time, you might remember the
day Ash was surrounded by a bunch of pokemon eggs.
He gave some of them away, but he still had a whole lot of them. And he kept them of course, because he's Ash!
And where did he keep them? With his pokemon!
Which means if you're near a certain
green gym/clinic you will see a bunch of tiny baby pokemon running around and an older Ash fussing over all of them.
He looks particularly ridiculous with a pink Sneasel on his shoulder, an Eevee on the other, and his Pikchu on his head.
Those baby pokemon are the baby or first stage forms of
his team.]