When you battle you get exp and when you get lots of exp your Pokemon will level up when your Pokemon get to a surten level the Pokemon will evolve (the level that it evolves on depends on the Pokemon) some Pokemon though you might need to get special stones for them to evolve E.G the water stone is needed for lombra to evolve. Budew is a special Pokemon if you want her to evolve into Roselia you will need to get up your friendship with her and then she will evovle you get yourfriendship up with Pokemon by just walking when you have taken a surten amount of steps she will evolve.
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There is not really a easiest pokemon to evolve...but bug type pokemon evolve really fast
Tynamo will evolve into Elektrik will evolve into Elektross with a thunderstone in Pokemon White.
Emolga does not evolve. I played Pokemon White also and it does not evolve. Some Pokemon do but this one does not evolve.
You have to trade the Pokemon to evolve it.
No. Neither of the Pokemon evolve.