Doom vs Magneto
There’s not enough bandwith on SRK to explain this match… but I’ll do my best.
Important Moves
s.fp- Should be using this move anyway… this move is especially good against Magneto, since it’s fast and hits Magneto before he can dash in and c.lk.
Ground Photos- Covers the ground quick and easly… and it’s hard to get around. G.Photon’s and Sentinel drones are also annoying to Magneto players… but make sure he’s far away though. (duh!)
j.hk- Instant overhead. This move out prioritizes many of Magneto’s ground moves. A good strat for this move is j.hk+drones then dash to the other side photon procede to rushdown.
j.lk- This move is QUICK… I’ve caught many Magneto’s by surprised by this move.
j.fp- in conjunction with sent drones and ground photons this move also important, this gives Doom an almost instant weapon that goes across the screen (think of it as a pseudo uni beam). As an added bonus… if someone gets hit by it multiple times, you can land xx Electric Cage.
df.fk- This launcher you should be using a lot more than the d.fp it’s his fastest launcher and an it’s one frame launch is really helpful.
Useful assist
Cyclops AAA - The all important and useful assist. Cyclops is one of Doom’s overal best assisters. Against Magentos, Cyclops + ground photons and other keep away moves is hard to get around. Also, if you manage to get Magento to block Cyc, rush him down! Cyc puts a decent amount of block stun on an opponent since he hits more than once.
Sentinel Ground - I’d say this is the best anti-rushdown assist, it covers the area right above Doom’s head, and then moves across the screen just getting in the way of everything, which means bad things for Magneto. Once Magneto sees this assist comming from close up, he’ll usually send out his AAA, or try to cross you up, or both. Prepare for that.
An important thing that Sent-ground does is also stop Magneto from continuing to combo you. So if you get hit by psy but psy doesn’t hit Sent, Mags can’t do much but try to possition himself for another offensive attempt.
And like mentioned above, j.fp + drones works wonders on Magnetos. This can get fairly annoying to Magnetos, so they’ll move around trying to avoid it (he’ll most likely sj out of it sometime) so, give him some ground photons to think about.
Another thing I like about Sent-ground is that if DOom is in a tight possition and a drone hits something you can DHC into Storm (via Roman Candle) and in most situations it’ll connect.
Psylock AAA - She’s really good against a sugar high Magneto, but good Magneto’s will bait her. It’s important when you use Psylock that you don’t use her too much. Magneto has that deadly triple fierce combo (drop AAA, launch fp, ad.df fp, fk). Or launch into hail or whatever. The good thing about her is that she covers both sides, taking away cross up options, and one hit is automatic s.lk, d.fp combo APA.
Other good assist
Cammy, CapCom is decent, Cable, and Guile
General Strategy
Ok, your going up against the biggest rushdown whore in the game. What are you gonna do? Runaway? Rushdown? Combination of the both?
I usually try to rushdown/trap. For example, I’ll start my j.fp + drones routine to get Magneto to sit there, then when the drones close in on Magneto I’ll run up to Magneto and see what he does (most likely try to ward you off w/ AAA)… that’s when you can fry his assist. If that Magneto isn’t so fast to pull the assist trigger, make him think twice by rushing him down. Normal jump rushdown w/ j.lk is quick! Or you can go for the instant overhead j.fk.
Make sure Magneto doesn’t gain ground on you, thats where he wins in this fight. If you find yourself on the defensive often, and Magneto is jumping all over your head, give him a Roman Candle, this super is Doom’s quickest and it covers the area right above his head. If you happen to miss, DHC into someone else.
If you happen not to have a enough super to DHC, I suggest you go for a j.fk, if Mag’s is under you. If he’s above you, try a df.hk or j.lp. Most of the time a good timed j.fk will work.
Runaway Doom
Once again, I’ve yet to see this tactic work against anyone with assist, but it looks like it really has the annoying potential that Storm runaway has. When Magneto sj’s then airdashes you can blast him in the face with photons.
Conclusion
Most of this match, your gonna have to play cat and mouse. Keepaway and rushdown. Try to bait his assist out, photon xx hail that shit. Make sure you keep Doom healty so Storm can use him. Storm/Doom = top tier! 
