different in terms of power (when compared to something like fire blast garchomp) and that a lot of mons will get access to a lot of options they usually don't have thanks to terra blast. while i think it is likely to be pretty gimmicky and inconsistent to run terra blast lure sets, it could easily add a pretty annoying level of variance into the game.
Is it really. Once you're terastalyzed your Volcarona into a ground type to murder that Heatran that walls you, your volcarona is now a ground type. Sure it has 3 stabs, but it is now vulnerable to being demolished by Kartana and Rillaboom.
Yes, these kind of sets will let you lure in and kill a otherwise dangerous check, but you'll pay the price by now having other checks due to the new type, or being vulnerable to hazards or conditions you weren't before.
By the way people talk of it, you make it seem like "anyone will just terastalize at random into random types and win games", forgetting the fact that in same way a Teralyze can win a game, a wrong teralyze can lose it.
In the example above, say opponent has both Heatran and Kartana. You *want* to lure in Heatran to 1hko it... except you can't take that risk because after that you're letting Kartana come in for free and run your team down.
And if you are able to take out Kartana first, then sure, but you'll have had to take down Kartana first while also running effectively 3-moves Volcarona who could have instead been a regular Volcarona with Gigadrain or Psychic instead.
It's not as mindless as people make it look like, and outside the first period of memes it will likely end up requiring skill to make a "gamebreaking unexpected Teralyze" work.
Or everything is out of the window and it gets banned because we hate fun and love stall (cit: reddit)
