It seems like some Pokémon take a lot longer to warm up to you than others, though I guess that can be true even with regular animals.

[By now the cart has been set up, and the workers are starting to bring it around to the starting point. He's not sure if Trunti is ready for his more rambunctious Pokémon, so he falters once their balls are off his belt before releasing them.]

Hold on a second...

[He retreats a short distance away before he frees them, waiting a moment for his Noibat and Plusle to calm down a little. Once they're over the initial excitement of being free he explains to them they'll need to be calm with Trunti, and not to get themselves too worked up. The Plusle nods, though he's clearly having a hard time not bouncing around too much as they approach the cart again. He does manage to restrain himself by keeping hold of the leg of Min's pants. The Noibat has been scooped up. He's still very young, so he's getting a lot of coddling right now.]

Sorry. I wanted to make sure they knew to stay a little calmer than they normally would. The Plusle's Ryan, and this guy's Echoes.