I've heard that the healing Palico are overpowered? How so? Do they heal quite often? How are protection Palico? I have one, but he also has last stand so once he dies he's done for the hunt so I can't get a good feel for his usefulness.
Palicoes are a bit complicated. There are many ways they can be fuckups.
Last stand can fuck you over, yes. Also, see what enemies they target first. I had a totally bitchin fighter, but what happened on an expedition while I was fighting gypceros and nerscylla at the same time with a light bowgun? He was chasing down kelbi, and then when he knocked them out he just stood 5 feet to the side and stared at them until they woke up and ran off, then he'd find another one. He got dismissed.
Slacking recovery is a bit give-and-take. If it plays out wrong, they'll forsake you when you need it most. If it plays out right, they use the time when you have the monster's attention to recover and end up lasting longer. The tank attack can be effective, but is basically useless against something that moves around a lot like a nerscylla. Bombers can be the shit if you're a gunner and play it smart, but suck if you have to be close to the monster and especially for GS and LS since a bomb will fuck up your charge/combo.
Sometimes they just suck and you don't know why. I had a protector once that thought blowing an armor horn once was all they needed to do. It literally just sat around doing nothing the rest of the fight. Never lived up to the "aggro the monster and tank" promise at all. Healers can also be great if they play horns to take away status ailments and restore life, but some of them think just dropping herbs on the ground is enough.
You can only ever have your main cat and one other one out right? I can't deploy more, it only ever says train.
What is the point of all the slots in the 1st string section?
To train more of them at once, so you can keep a few at higher levels without needing to keep an even balance of who fights with you, so you can have different types at the ready suited to different fights.
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