What are some generation exclusive Pokemon moves?

Question

For example, in generation 5 and 6, Skarmory is not able to learn the HM Defog because it only appears in generation 4, making Skarmory a pursued defogger on any team.

Are there any more examples? Thanks!

Answer 1

There are quite a few. This is mostly because Gen 5 Defog status.
Charizard, Mantine and Flygon can no longer learn Defog.

In Gen 5 move tutors were given a lot of moves like Superpower, Signal Beam, Low Kick, Giga Drain etc.
Many of these moves are no longer learnable by Pokemon in Gen 6.

Eg- Volcarona can no longer learn Giga Drain
Gardevoir and Eevee can no longer learn Hyper Voice
Metagross can no longer learn Thunder Punch

Hope I helped!