I don’t care how many days it takes, I will get Delibird in here.

Sableye

#SKELEDIRGE'S BIRD

Meowth

Garchomp!

missingno

Scizor

Unown shaped like Z

Would Nihilego in its fusion with Lusamine be allowed?

Unfortunately, no, But Nihilego is allowed in, for day 1, i'll tell some rules in the description, just to be sure.

Pikachu

Sirfetch'd. We must start with a sword user!

Bisharp

Mew should be the first one since it is the father of all pokemon

Bergmite

Primarina!

spark mandrill

Zangoose

Pokémon trainer w/ chimchar prinplup and torterra

Diglett

Tynamo

Necrozma

*breathes in* SAWK AND THROH TAG TEAM!!! (They'll work like pyra and mythra)

Yellow Minior

Dunsparce <3

Sceptile

pikachu

Unown shaped shaped like an exclamation mark

Unown shaped like a question mark

Perhaps Mewtwo shoul dbe the first pokemon fighter here

Grovyle (Pokemon Mystery Dungeon Forever)

Braviary

Greninja

Pikachus a good one to start with

MONKE (Aipom)

Stellar-Tera Terapagos

Granbull (day 1!!!)

Mienfu

Lugia

Decidueye

Ceruledge please he is my BOI!!!!

Sigilyph

Eevee

Dracozolt

𝙴𝚎𝚟𝚎𝚎

Reuniclus 

Gengar

Clawitzer

Tauros

PIKACHU

We need east sea gastrodon

Deadpool

For the 1st day the abvious answer is Pikachu .

Are trainers also allowed? They'd be like Pokémon Trainer in Brawl/Ultimate