Roselia @PokemonFan26 You also put Raticate as a suggestion, so I naturally assumed that the second stage evo was its final form
Stupid memory... Alright, here's the final clue! If you don't get it now, I'll be surprised. This Pokémon is used by Koga in the following games: Yellow, Gold, Silver, Crystal, HeartGold and SoulSilver.
I've done 2 now, so I guess I'll go next? This Pokémon has a signature move that no other Pokémon knows.
First clue: this Pokémon has a signature move that no other Pokémon knows. Second clue: there is only one ability this Pokémon can have.
Most Pokémon can have one of multiple abilities, like how Riolu can have one of three; steadfast, inner focus, or prankster as a hidden ability. The Pokémon I'm hinting at only has one.
First clue: this Pokémon has a signature move that no other Pokémon knows. Second clue: there is only one ability this Pokémon can have. Third clue: this Pokémon could originally be found in the Sinnoh region.
Im a bit late replying, but the Pokémon I was thinking of was Cresselia. I think it was kind of tricky because its signature move, Lunar Dance, isn't one that does damage so it's probably overlooked.
Oh. Well, to be fair a lot of Sinnoh Pokémon had a 'signature move' (especially the Legendaries)... perhaps a clue that referenced its Pokédex entry would've made it a bit easier?
Nice one @Wolf Expert Cresselia probably would've been my last guess, so good job for at least stumping me!
I did try to narrow it down a little bit by saying no other Pokémon could know it, but that does apply to a lot of the legendary Pokémon in that generation. I was thinking more about how Darkrai could have Roar of Time or Spacial rend, so at least Dialga and Palkia wouldn't fit. I thought of using its Pokédex entry but I thought it would be too obvious if I did. I probably should have.
That's one reason I chose Vespiquen. It can only know Pressure (outside of those silly Hidden Abilities they added from B/W's Dream World) and learns two unique attacks: Defend Order and Attack Order. No other Pokémon (in DPPt, anyway; no idea if they gave those moves to anyone else) can learn those attacks.
I was counting hidden abilities too, so Vespiquen wouldn't have fit. I used Riolu as an example earlier to clarify. "Most Pokémon can have one of multiple abilities, like how Riolu can have one of three; steadfast, inner focus, or prankster as a hidden ability."
