Disagree. Curse/Sub/Leech set is one of the reasons why Trevenant is so good. With Harvest + Sitrus you have all the recovery you need. It's even better if you managed to get a Leech seed up.
If they switch out from Curse I simply set up another sub (if it's broken) or Leech Seed/Shadow Claw whatever else comes in. If it's something that's going to try to setup against Trevenant, it gets Cursed.
Curse is also your only real way to deal with Normal types, and especially walls like Chansey, Blissey, Sub/Toxic Gliscor, Slowbro, etc.
If they have no way to heal, Curse whittles them down to where they can easily be revenged. You can also keep cursing away as Harvest + Sitrus gives you plenty of ample recovery. --- 3DS FC: 1977-1571-8378 IGN Heisenberg TSV: 2336
You can switch out yes, but it really laughs at any Baton Pass team since their goal is to NOT switch. To really add insult to injury the curse passes as well. If you can grab a sub on a switch in, it can be a pretty much guaranteed KO if they don't switch (barring Infiltrator and the likes), and if they do, just do residual damage. No Pokemon really likes 25% of their health drained. It really is a nice set. --- 3DS FC: 0387-8896-1092
It has 5 IVs! I used it in a Multi Battle today, and it was amazing! When I was burned by a flare blitz from talon flame (which didn't do much), I went and rested + retreat for natural cure to kick in, --- 3DS FC: 0533 - 4952 - 7611 Psychic Safari: Duosion, Wobbuffet and Grumpig
It has 5 IVs! I used it in a Multi Battle today, and it was amazing! When I was burned by a flare blitz from talon flame (which didn't do much), I went and rested + retreat for natural cure to kick in,