Ledyba evolves at level18 into Ledian.
lv 18
it will evolve into LEDIAN at lvl 18 in pokemon Green leaf..
18
Stantler does not evolve.
graveler doesnt evolve at a level, you evolve it by trading.
Level 20.
Level 20
Level 23. 
it will evolve at lv. 20.
Your Aron will evolve at level 32 into Lairon.
Level 27.
14