Spore on Meganium/Jumpluff alone is fine (added to lv up movepool), but tutor would basically mean every grass type (that could learn it) would abuse it. Things like Scpetile would be far more used.
Spore on Jumpluff would be ridiculous.
Spore on Sceptile would be near broken. Seriously, if you only have one phazer, say Skarmory, what are you supposed to stop something with 120 base speed with when it gets slept? Same thing for Shaymin-S. When I say broken, I mean for UU, since Scizor stops SubSeed easily.
Unfortunately, I don't see Torterra or Abomasnow receiving Spore if there is a tutor. He would be a very fun sweeper since if they send in Skarmory or Bronzong you simply sleep them.
An Extremespeed tutor would be cool, Garchomp would 100% get it, which would further lower the amount of SD Rayquaza users.
Entei and Flareon would actually make it into UU with Flare Blitz.
Close Combat on Typhlosion... While it would be useful in game, competitively it is still outclassed by Blaziken/Charizard in UU, and Infernape in OU.
Nobody wants elemental fangs, or atleast not me(heart scale gets you them on most pokes anyways).