Alakazam has max speed of 372. Aerodactyl's speed is 394. Since your Alakazam went first and didn't have a Choice Scarf (which I know because you switched moves) that means it is a hack. And a D/C means disconnect, though I can't accuse you outright of that since it could have been the connection. But you can't bring hacks to our league as that warrants a ban.