Here are some specials I came up with for some of the Poke Ball summons:
Meowth
B : Pay Day; Meowth flings a flurry of coins as long as B is held; the attack gets weaker over time
B + Forwards : Thief; Meowth pounces the opponent; if they have an item or shoot a physical projectile, Meowth steals it
B + Up : Blast Off!; Meowth is launched high from a small explosion
B + Down : Fake Out; Meowth feigns a defenseless look, then slaps the opponent twice when hit
Final Smash: Rocket Balloon; Jessie and James appear and catch opponents with a huge net, only for their hot air balloon to pop and fly offscreen as Meowth falls off
Scizor
B : Bullet Punch; Scizor rapidly punches the opponent when B is held, finishing with a powerful punch when B is let go of; the attack gets weaker over time
B + Forwards : X-Scissor; Scizor flashes forward and slashes the shape of a horizontal X, which can hit up to four opponents at once
B + Up : Aerial Ace; with help from the wind, Scizor slashes with both pincers and is launched high upward
B + Down : Swords Dance; Scizor summons two clanging swords behind itself, then slashes with both pincers
Final Smash: Mega X-Scissor; Scizor Mega Evolves into Mega Scizor, slashing furiously and finishing with an X-Scissor that covers nearly the entire screen
Mimikyu
B : Dazzling Gleam; after holding B, Mimikyu emits a shining light that covers a large area
B + Forwards : Play Rough; Mimikyu tackles the opponent in a cartoonish cloud as it hits them repeatedly
B + Up : Fling; Mimikyu propels itself straight upward using one of its arms; this can either Meteor Smash opponents or force Mimikyu to drop an item it's holding, both of which propel it slightly higher
B + Down : Astonish; after holding B for 1.5 seconds, Mimikyu astonishes opponents directly in front of it, briefly stunning them
Final Smash: Let's Snuggle Forever; Mimikyu extends its arm to grab opponents; the opponents are then taken into a cutscene where Mimikyu..."snuggles" with them inside its cloth, instantly KO-ing any over 100%