Give your ideas to make Pikachu useful in the metagame.
Make Mega Pikachu and Mega Raichu, but make both of them identical in ability and stats
That way, Mega Pikachu doesn't invalidate Raichu, and Mega Raichu doesn't invalidate Pikachu; they're equals, and the choice is up to the player's preference
What do you think?
I call it Mega Pikachu
I know it isn't much but I hope it will catch on
This could be good. The main issue that Pikachu faces right now is that it's too slow for the meta. If it could either get a huge speed stat bump or like you said a priority electric move/speed boosting electric move it would definitely move up. I like the idea of Pikachu being a glass cannon type Pokemon, but it really needs that speed stat to let it do anything.
Or give it a mega evolution