scyther does not evolve by leveling up in any game. To evolve scyther give him the mettle coat and trade him he will evolve if you do that. Have fun.
GO LUGIA
Scyther evolves by trading it while it is holding a Metal Coat(item)
scyther evolves using a metal coat on whatever level he is on.
It evolves at level 16.
It evolves at level 21.
Ekans evolves at level 22.
Magicarp evolves at level 20.
Meditite evolves into medicham in Pokemon heart gold/soul silver at level 45
Pidgey evolves at Level 18 to Pidgeotto which then evolves into Pidgeot at Level 36.
Totidile evolves at the exact same level as it does in heart gold. Level 16, And Evolves Into The Water Type Pokemon, Crawknaw. Then later evolves into Feraligatr At Level 36.
cindaquil because it evolves at an early level. =)
Caterpie evolves into Metapod at level 7 and Metapod evolves into butterfree at level 10
Cubone evolves at level 28