I don't know if someone else suggested this before, But I'll post it anyway.
Magneton deserves a Steel type movement.
Since gyro ball would be pointless, my suggestion is to add Mirror shoot, or create a new steel type movement for magneton, Magnet bomb (Same kind of attack as Falling rocks/thunder bolt, but with another animation and steel type)
I think this is good idea but, stuff can add some steel but remove some electric move, maybe thunder. Ask why? Becouse Magneton its steel/electric(resistans vs 13 types), he run, paralise and have super sonic and can learn reflect/tri attack/Discharge i think this will be too much.
When he get somethink like doom desire he will be the best electric poke. Lvling at electric pokes will be imposible, all time confusion or paralize.
Sryy for me english i hope all understand what i mean.
My suggestion is:
1. I Think this make him too much OP
Name: Magneton
Type: Electric/Steel
Moves:
Super Sonic - m1 - level 30 - 15s
Thunder Shock - m2 - level 30 - 15s
Thunder Bolt - m3 - level 30 - 15s
Thunder Wave - m4 - level 30 - 20s
Sonicboom - m5 - level 30 - 30s
Thunder - m6 - level 40 - 30s
Shock Wave - m7 - level 40 - 25s
Electric Storm - m8 - level 50 - 60s - remove and add doom desire
Or
2. I think this is the best option
Moves:
Super Sonic - m1 - level 30 - 15s
Thunder Shock - m2 - level 30 - 15s
Thunder Bolt - m3 - level 30 - 15s
Thunder Wave - m4 - level 30 - 20s- remove and add flash canon(animation like zap canon with steel dmg)
Sonicboom - m5 - level 30 - 30s
Thunder - m6 - level 40 - 30s
Shock Wave - m7 - level 40 - 25s
Electric Storm - m8 - level 50 - 60s
3.This option make him good but not much OP
Name: Magneton
Type: Electric/Steel
Moves:
Super Sonic - m1 - level 30 - 15s - remove and add mirror shot - Stun + some dmg but not very high(idk how make animation but i found this http://padventures.info/Mirror_Shot)
Thunder Shock - m2 - level 30 - 15s
Thunder Bolt - m3 - level 30 - 15s
Thunder Wave - m4 - level 30 - 20s
Sonicboom - m5 - level 30 - 30s
Thunder - m6 - level 40 - 30s
Shock Wave - m7 - level 40 - 25s
Electric Storm - m8 - level 50 - 60s
What all think about this?