Any one of these would be fine:
Zoroark
Dunsparce
Requaza
Groudon
Kyoger
The regis (or a new regi to resemble the future)

Jumpluff, Marill

I would say Hydreigon, sense that’s my favorite Pokémon, but sense it already has one, let’s go with Cinderace or Tangela. They’re two of my favorite Pokémon that don’t already have paradox forma

Eiscue

Chandelure?

already exists

That’s something I didn’t know.

exists as fanart

ampharos

mamoswine, since it's supposed to be a mammoth, which are extinct, i would like to see a future version

tatsugiri and dondozo

Phantump and Trevenant

Vikavolt

The starters

Latias Latios fusion --- sorta like Iron Valiant