In Robopon 2, rather than have an even stat curve 1-100 (excluding evolutions) like Pokemon, or only being able to get a few levels before the XP requirement becomes absurd like MegaTen's demons, each has a level it caps its stats at and only gains HP and MP. This would be fine if the game told you this in any normal way (like saying it leveled up and show all 0s for stat increases), but instead you have to go all the way back to an early area and speak to a specific NPC who will imply the stats were capped or not. Making matters worse is that you're often stuck in an area and can't backtrack until progressing the story, so you can't just go back and check.
The second Robopon you get is also determined by the birthday you enter, being one of four possible results. That's not too bad though since these Robopon are only given out early, not exclusive to this event.