False, Xerneas is the #1 most common fairy-type I encounter on Battle Spot. So it is probably the best representative for the type in my opinion.
Well, of course; it's an easily obtainable legendary. But it isn't representative of Fairy-types, precisely because it is a legendary and hence overpowered. We weren't talking about Xerneas counters, we were talking about Fairy counters in general. The fact that it's everywhere in Free Battles is neither here nor there.
How long can you be frozen? My Sableye was frozen for FIVE TURNS!! Stupid Ice Beam, I can say I have never froze things with that move. But other people use it in me, I freeze. Every. Single. Time.
You can be frozen forever, technically. There's a 20% chance of thawing each turn.
EDIT: Oh, and using Flame Wheel, Sacred Fire, Flare Blitz, Fusion Flare, or Scald thaws you out.
1) Thunder wave is to Paralyze, Will-O-Wisp is to burn, Toxic is to poison, is there a move that just freezes, or if only damaging moves are there any that have a high percentage of freezing?
Nope, there's no move that has 100% Freeze chance. And I believe all moves that do have a chance of freezing are 10%, except Tri Attack which is 6.67%.
2) Paralysis lowers speed, Burns lower Attack, does Poison have any additional effects? (Besides toxic which just does higher damage the more turns that pass)
There are many Pokemon with Abilities that activate upon being poisoned, and there are moves that have increased power when the user/target is poisoned, but there is no universal effect like for paralysis and burn.
3) What's your CHEAPEST or most powerful or impressive moveset for smeargle?
I've been working on a team that revolves around exploiting Critical Hits, and Smeargle is a potential member, although I haven't tried it out yet. Its moveset would be: Focus Energy, Quiver Dance/Shell Smash, Spore, Baton Pass. The strategy would be to use Spore first, then Focus Energy, then Quiver Dance/Shell Smash if possible, and then Baton Pass to Kingdra/Drapion. Kingdra would have the Sniper Ability and be holding Scope Lens to give it 100% Critical chance, and Drapion would have the Sniper Ability and Night Slash and Cross Poison to give it 100% Critical chance.