I can't find palkia weak to salamence anymore but I found this : r/jaidenanimations

Palkia (Pokémon GO) - Best Movesets, Counters, Evolutions and CP

Palkia - #484 - Pokédex

So idk if this has been brought up yet, but if you look on google it says that palkia is salamence type (mind you salamence is the dragon pokemon) on top of

Palkia counter weakness by RedDemonInferno on DeviantArt

Pokémon GO: Palkia Five Star Raid Guide (Best Counters & Weaknesses)

Palkia GX - 132/131 - Secret Rare - Pokemon Singles » Sun & Moon Sets » Forbidden Light - Spell Bound

Origin Forme Palkia VSTAR (040/189) [Sword & Shield: Astral Radiance] – Pokemon Plug

Palkia Lock Still Locking On — SixPrizes

Pokemon Sword and Shield Palkia

Palkia VSTAR Sets Up Insanely Fast!- PTCGO Expanded