It's that game everyone knows, but with a twist: instead of posting a silhouette, you give players any combination of information that is enough to uniquely identify one Pokemon. You could say that it's a unique encounter in Cerulean cave, for example, or that it's seen in the first part of the startup animation of both Red and Blue. Or anything else you want! Whoever answers correctly posts the next prompt, and we go until everyone gets bored and the thread dies. You know, the way every forum game ends.
Who's the Pokemon that can have this build?
Ability: Inner Focus
Moves: Mist, Agility, Roost, and Water Pulse
EDIT: This is based on SwSh. I did not check if there are multiple answers in other games.
Bonus (imaginary) points for getting it without using reference sites or tools, but that's not a requirement.