Question about other trainers and items

[Carbonite4]

Do opposing trainers have a set number of items they can use? As in, they only have 5 full restores, and if they use all of them on their first Pokemon, they can't use anymore, or is it, let's say, 2 per Pokemon?

For example, I'm fighting Wallace right now, and he used 3 full restores on Whiscash and 2 on Tentacruel. Is there a limit for the number they can use, or is it unlimited?

[Silent Dragonfly]

I'm pretty sure there's a limit. Many times when an E4 member's pokémon is in the red layer of HP have used a couple of full restores, but stopped using them when I've brought their HP down to the same level.

[Elekidkid]

Yeah, there's definately a limit. I remember back in the days of RBY, at least, trainers would only use one or two healing items despite the need to use another again. Afterall, what fun would it be if the E4 just kept on healing when you got the HP to just low enough?

[Carbonite4]

I'm pretty sure there's a limit. Many times when an E4 member's pokémon is in the red layer of HP have used a couple of full restores, but stopped using them when I've brought their HP down to the same level.

Right, I've noticed that, but it seems like they'll use 2 or so and then stop, so perhaps it's per Pokemon?

Afterall, what fun would it be if the E4 just kept on healing when you got the HP to just low enough?

Precisely my point and problem with Wallace. I knock everyone out in more or less one hit except Whiscash, who keeps getting full restored. I always get him to red, but he heals. So I was wondering if it's per Pokemon or total for all of them, because if it's total, that explains why Whiscash lives forever.

[Poryhedron]

I don't know what your exact situation is, so I don't know if this helps at all, but here's a trick I learned early on: Don't let the enemy get into the red. Whittle it down with weak attacks until it's got maybe a third of its life left (still in yellow,) and then whack it with something strong enough to finish it from there.
Let's say you have move A, that can take off 45% of its life, and move B, that can only take off 20%. A battle might go like this:

OPPONENT used a move!
YOU used MOVE A!
OPPONENT is at 55% health!
-------------------------
OPPONENT used a move!
YOU used MOVE A!
OPPONENT is at 10% health!
-------------------------
OPPONENT used FULL RESTORE!
OPPONENT is at 100% health!
YOU used MOVE A!
OPPONENT is at 55% health!
-------------------------
OPPONENT used a move!
YOU used MOVE A!
OPPONENT is at 10% health!
-------------------------
OPPONENT used FULL RESTORE!
OPPONENT is at 100% health!
YOU used MOVE A!
OPPONENT is at 55% health!
-------------------------
OPPONENT used a move!
YOU used MOVE A!
OPPONENT is at 10% health!
-------------------------
(this is when you catch on and start acting smarter.)
OPPONENT used FULL RESTORE!
OPPONENT is at 100% health!
YOU used MOVE B!
OPPONENT is at 80% health!
-------------------------
OPPONENT used a move!
YOU used MOVE B!
OPPONENT is at 60% health!
-------------------------
OPPONENT used a move!
YOU used MOVE B!
OPPONENT is at 40% health!
-------------------------
OPPONENT might use a Full Restore...but decides 40% health isn't in the danger zone...
OPPONENT used a move!
YOU used MOVE A!
OPPONENT fainted! Sucker!