Ok, i have finished Sceptile's profile so now i can input things here
First of, i think it is safe to say that Swampfire has only 3 advantages here(thoug they are really big advantages) that is his Fire Manipulation, lifting strenght and his Low-High Regenerationn.
Versatility, range, speed(via amps and priority), AP, even his Sleep Powers are stronger. That incial range really give Sceptile a good start advantage, since most of his moves can easily hit Swampfire from that distance, but Swampfire can easily survive those hits and reach Sceptile, and i think that Sceptile may have the edge in CQC, which would problaby make Swampfire use more of his range moves and Sleep Powers, but only his Fire Manipulation would really hurt Sceptile. Sceptile may have not a Regen, but Synthesis, Leech Seed and Grassy Terrain will make him last more. Sceptile can also amp his Speed to easily blitz and evade incoming attacks from Swampfire, and also reduce his defenses via Leer and Screech. While his evasion is reduced, after Sceptile is below 25% of health, he will evade Swampfire's moves more easily before healing, and if he tries to use a tactical retreat, Sceptile can use Pursuit to punish that.
But, here is the thing, i don't think that Sceptile have ways to bypass Swampfire's Regen, even with Swampfire's defenses low, in Grassy Terrain, with Leaf Blade or Bullet Seed landing a critical hit, i don't think it will be enough to bypass that.
I will go with Incon, Sceptile have no ways to bypass that and after Sceptile amps his speed, Swampfire will barely even touch him after the speed amps and it will be even more difficult if Sceptile is really low on health. With Leech Seed, Synthesis and Grassy Terrain, Sceptile will problaby not get tired from this battle
