Charizard's faster.
I think Butterfly Dance might be an interesting move on Magnezone. It's Sturdy, so it doesn't have to worry about Sheerchamp, and has very solid physical defense. Even better, it also has an excellent SpA and a usable movepool to abuse the +6 with. I'm thinking something along the lines of
Butterzone@Leftovers/Lum Berry/Balloon
Bold, Sturdy/Magnet Pull (if you want to try and set up on Steels)
252 HP, 252 Def, 4 SpD
Butterfly Dance
Thunderbolt
Magnet Rise/Flash Cannon/Signal Beam
HP Ice
Some setup is required, of course. You might want to toss up Safeguard to protect from Sleep until a reasonable level of speed is reached, and you probably want something to switch into to take Earthquakes. This thing needs 2+ Butterfly Dances to even think about outspeeding a Scarfer, but is strong if it is allowed to get going.