Necro's corner pressure is just as dangerous as Dudley's which means this match-up will require constant walking forward. The problem is that he can zone you out using his moves which means parrying will be of importance in this match-up. Learn to parry his revolving punch, electric and overheads. Sean, if defense permits, can punish his main long range normals after parry with Tackle (depending on dist.) Also if Sean manages to walk him to the corner, he becomes that much more dangerous. Cl. HK is important in this match-up as this is the only match-up where Sean's strongest ground combo (Cl. HK x EX Dragon Smash) is able to be utilized outside of a basketball toss situation but only if the Cl. HK is on Meaty or if he's stunned (again you won't need the basketball). Necro can also be crossed up if hit with a EX Dragon Smash with only 1 dash if he quick rolls. His hit-box is massive, which means you can land combos in this match-up which you wouldn't normally