Luckily, baltoy are actually fairly easy to care for. As artificial pokémon, they don’t need food, water, or the like, although they may enjoy eating now and then. That is to say, it’s okay to give them poké beans, poké puffs, kibble, or so forth, but they won’t die if you forget to do so.
Beyond that, simply give your baltoy a level, solid surface to rest on as well as toys to amuse itself with (baltoy have no specific preference, so experiment with yours to determine what it seems to like), and it will be perfectly happy.
In terms of things to be aware of, be sure to include meditative training when honing your baltoy’s abilities. Its strongest techniques rely heavily on its telekinesis, so the more you strengthen that ability, the better your baltoy’s handle on its moves will be.
Additionally, try to avoid allowing your baltoy to come across another member of its species. Baltoy get along well enough with most pokémon, but for reasons we researchers haven’t fully figured out, when it spots another baltoy, the two will congregate together and begin vocalizing. The resulting noise tends to be ungodly.
Best of luck, anonymous!