>>45625048If you pick yellow, just ditch Pikachu and play normally. You can still get Bulbasaur if you really want, just abuse the potion glitch to make the little rat happy.
If you do the route 5 trade, you get a fast levelling Machamp for a Cubone.
Don't fall for the 3 starter meme, wait a bit and get yourself a Staryu to evolve into Starmie to use as a water type. Surf/Thunderbolt/Ice/Beam/Psychic will shred most of the game and give you tons of coverage so you don't have to worry about catching certain pokemon to fill a hole in your team.