you could use cheats for action replay like 900x medicines.that will give ya 900 rare candies.or you can use the cheat for super exp gain. thatll give ya like,1000000 exp points.
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First of all, whoever told you the other thing was stupid. You can't get you Pokemon up to level 150 on ANY Pokemon game. The max level is 100, no higher. There might be an action replay cheat for it but I'm not sure, I've never seen a cheat like that before.
no when it is level 100 you cant evolve it any more
lv.40Evolve it at level 40 any timeSnover evolves at level 40
Yes. Level 100 Pokemon cannot earn Exp. Points any longer, but otherwise are completely normal.
Assuming you mean Pokemon Diamond/Pearl/Platinum, you level up a magnetron in Mount Cornet, by any means (only one time is necessary), and it will evolve. I don't know what to do if you magnetron is already level 100.