There is no best level to evolve Magneton into Magnezone as long as it knows Tri Attack before you evolve it if you want it to know Tri Attack because Magnezone cannot learn Tri Attack in any way because other than Magneton learning Tri Attack via the Move Re-learner, their move pools are exactly the same except for a Move Tutor being able to teach Magnezone the Iron Head attack which is a move that Magneton cannot learn.
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go to moutain Coronet and get him a level up then magneton evolves
It evolves to Magneton at level 30. Then, you can evolve Magneton into Magnezone by leveling it up in Chargestone Cave.
Magnemite evolves into Magneton starting at level 30.
Magnemite evolves into Magneton on level 30.
level it up in mt. coronet