>>24898153Poison doesn't work on poison types, burn doesn't work on fire types.
That's it. Burn does NOT have the attack cut part it has in regular Pokemon; that's it's own status effect in this game (Darkness). Will'o'Wisp still inflicts both at the same time so it mechanically works the same way.
Paralysis, unlike how in regular Pokemon it quarters speed and has a 25% chance to prevent any action, here only halves speed and nothing else.