For the most part, Pokemon can be mature and capable of breeding at any stage.[Apart from literal baby pokemon, but let's not go into that.] I imagine most don't breed until they are Wailords because that way they'll be better equipped to protect their young.

[Having her lean into his personal space is a little weird and awkward, being that Armin isn't Mr easy-physical-touches, but he'll deal.]

The people I work with put it on my gear for me. I'm not sure how to download it myself, but if you wouldn't mind dropping by the research centre, I'm sure they'd be more than happy to show you how.