here's a MOCKUP of the jankies battle screen that i made a while back (and touched up today)!
the numbers don't really make any sense (they're just placeholders)
you use the same pool of points for all of a janky's moves (so less like pokémon PP and more like earthbound PP); also a move's power and required points are identical
no items in battle! none whatsoever (sole exception being the cards used to catch jankies. yes it's done using cards. yes like in super paper mario.)
if one of your jankies needs healing, you can use type effectiveness to your advantage! certain type interactions will heal the target rather than damage them (e.g. hitting a bone type with a cheese-type move), which means you can attack your own team with the right moves in order to heal up.
in-game type chart (trust me this can work in 1-bit)
the SWAP option lets two jankies swap places with one another. this also means that if you expect to be hit with a certain move that might heal a different janky on your team, you can make them trade places to have the enemy heal you by accident instead!
not pictured, but one of the status effects you can inflict is turning a janky around, making them face away from the other team (yes like in mother 3). this makes them waste one turn, where instead of attacking they'll turn to face the enemy team again (can happen during the same turn if they're slower than you). if you hit them while they're facing away from you, it's a crit
another status condition is "needs to sneeze"! with every turn, there's a chance that your move fails because your janky "needs to sneeze but can't"—until they finally DO end up sneezing, potentially passing the status effect to the other team.
by the way the whole reason why this is in black and white is because it all started out as an idea to make for the 1-bit Playdate handheld! the SDK is free and you don't even need the real device to play games made for the system OR even to develop for it! the people behind it encourage people to make games for it which is extremely cool and my god is it so much easier to set up than homebrew dev tools for nintendo systems