I will do one
This pokemon is a psychic type and can learn moves from all types

Easy. Mew.

I feel i shall proceed with the next pokemon.
It in a tier above RU (, not RU itself).
It learns swords dance, although it mostly plays a defensive role.

Ferrothorn or Skarmory?

Its skarmory, I didnt know ferro learned sd, some vgc people sjould use that

Same hints as cadentube, except it is used in an offensive role.

Gligar!
Totally an offensive pokemon. <.<

no

that's tricky, due to SD being a somewhat common offensive move, terrakion? garchomp? haxorus?

Lucario