Nice job! I hope I can be of help.
For starters, change the EV spread to outspeed minimum Speed Gligar and Suicune. On most defensive Pokemon, you usually first max out HP and then the defense of choice. I'd advice you to change the spread to 252 HP / 96 SpD / 160 Spe Calm, since it accomplishes the same the 220 HP EVs do (I think, you can ask for more input on it anyway). Mention that outspeeding Suicune is important to Roar it before it Roars you out, if you're opting for Toxic then you can go max/max or use the same spread to KO Gligar before it does anything, which I don't know if it's really important.
Remove the Toxic Spikes mention in Set Comments, that's the kind of things AC is for, where you already mentioned it. Instead, mention the perks of Roar and Toxic, such as adding up hazard damage, and being able to stall Pokes one v. one in Toxic's case.
I think that's pretty much it, great job on you first skeleton.