There is no such thing as a Shadow Pikachu. Shadow Pokemon were only ever a Gamecube thing (and could only be traded away from XD and Colo once purifed.)
The Shadow Pikachu card has 999 HP.
There is unfortunately no such thing as shadow pikachu if someone has one it is fake
You Can get a pikachu by going to trophy garden
You can't get a Shadow Pikachu on Ruby/Sapphire/Emerald.
the same as pikachu's static and lightningrod
go underground and get a thunderstone and use it on pikachu
There is no shadow pikachu in either one of those games.
at the computer
Pikachu does not evolve by level in any Pokémon game, including Pokémon Platinum. Pikachu evolves into Raichu when a Thunder Stone is used on it.
pikachu then pikachu evolves with a thunderstone to get raichu
There is indeed a shadow Pikachu. Many people in the world have drawn this incredible Pokémon in many different poses.
That is an opinionated question, but since Pikachu is the primary mascot of pokemon, and Shadow is a secondary mascot (Sonic is obviously the primary) I'm going to have to say Pikachu.