In Pokémon White, Metang evolves into Metagross starting at Level 45.
level 45
metandg evolves into metagross at level 45
beldum evolves into metang at level 20
It does not evolve.
Metang evolves into a Metagross at level 45
It doesn't evolve.
Throh has no evolutionary line, it does not evolve.
Level 45 (Sometimes if you put the Pokemon in daycare and take it out when it is at the evolution level you will have to level it up a bit more before it evolves because Daycare does not evolve Pokemon)
Happiny
Check Serbii. net
It evolve when it is very happy with its trainer
at level 40