Does Pikachu need a Mega Evolution?

I know that Pikachu has a regular evolution, but does it really need a Mega Evolution as well or not?

But aint raichu the very last evolution so shouldnt it be that? Because fully evolved pokemon are the only ones that mega evolve

I know that Raichu is the evolved form of Pikachu, but I'm asking does Pikachu need a Mega Evolution despite the fact that only fully evolved or Legendary Pokemon can Mega Evolve. I'm just having this feeling that Pikachu might have a Mega Evolution in the future even though it isn't a Raichu yet if you know what I mean.

Well if thats the case wont all 2nd evolve pokemon get a mega evolution too cause then that would create more extra evolutions to make and thats gonna take alot more to process but i guess it be coll if he did have one.