Battle credit for heals?

[Jojoya]

1) Be in a party. Credit is based on enmity generated and party enmity is shared between members who generate enmity on the hunt mark through damage dealt or through heals to players who have dealt damage to it. If you are solo on a congested train and only healing other players in a party, you likely won't generate enough enmity by yourself to get rewarded. Even a solo tank with stance on and spamming their ranged enmity generator may struggle to get a "bronze" rating on a congested train. Speaking of tank stance...
(edit: I don't know if only effective healing will generate the needed enmity or if overhealing will as well)

2) If you are a tank, use your tank stance. There's zero reason for not using it on a hunt train. It increases the enmity your party generates, helping to get the best possible credit.

3) If you're playing on a PS4 or with a slow internet connection, you may want to consider skipping hunts the first two weeks of a patch if they are crowded. They're more likely to be a source of frustration then benefit. No matter what conductors try to organize a train so that everyone attending gets credit, they cannot control what individual players do and how the rest of the train reacts to those players. Conductors who prefer to run bullet trains frequently don't care if they're getting credit themselves - their goal is to get the train completed as quickly as possible, not to help everyone get credit.

4) If you have that good connection or console/PC that allow you to mostly keep up with the train, you can help those with slower connections or older consoles/PC. When someone ignores the conductor's waypoints, goes out scouting and pulls before everyone has made it to the hunt mark, hit the mark once so you're on the enmity table then stop attacking. Tanks are generally safe if they stick to using their ranged enmity generator since it does relatively little damage compared to the standard rotation but generates a large amount of enmity. If only a dozen players are ignoring the conductor instead of half the train, the mark will die slower and more players will have a chance to get their in time.

In the end, it's up to those attending to make the train a good experience for everyone who shows up. Don't contribute to the problem of players who are incapable of being considerate to others also attending.

[Rongway]

Credit is primarily enmity based. The thing about heals though is that they generate very low enmity to begin with, and SMN even less because their heals only heal for a tiny fraction of what a SCH's Physick heals for. Heals naturally have a 50% enmity multiplier and the enmity is spread out among all the enemies that have you or your target on your enmity list. So if you can heal for 1,000 hp, you'll generate about 500 points worth of enmity and that enmity will be divided amongst all the enemies. But if you can heal for 1,000, you can probably Ruin for about 10,000, which would be worth about 10,000 points of enmity.

If you want credit as a red job, you should always just attack.

[MsQi]

no matter the case, if you're a healer: Put your DoT on it!

[Asako]

Aye but what people are saying is in the larger hunts people on weaker machines might not see the enemy load. If you are unable to target the boss you can try tossing a heal on someone in your party to get the heal credit from them, try and hit a melee dps or tank with it as with their faster GCD's and auto attacks they are more likely to already be engaged with the target. Try aoe moves like Assize ect and place your healing bubbles if you have one over the target to clip any melee in your team.

If you have more time and you still can't target the boss, target another player and manually click the bosses name from their target thus allowing you to target it.

[Hanayumi]

Have to hit the boss at least once to get credit, it was a change a long long while back. <TT> or an aoe in mid if group usually does the trick if youre have a hard time seeing the hunt, way you can tell is if it pops up in the enemy list.

[Iscah]

WHM's Assize spell is a quick easy way to successfully either hit the boss or heal someone who has hit it. Instant cast, single button press.

[Renathras]

I'm not sure if you HAVE to hit the boss, but I always do just to be safe.

If you have SMN leveled to 90, that means you have SCH, so I'd suggest running the train as SCH. At this point, you should have some way to get level 90 gear for it, and you don't exactly need advanced gear for Hunt trains. If you can target the boss, Biolysis or Ruin 2 it then spam Succor. If you can't target the boss, run into the middle of where all the players are and hit Art of War a few times. It's instant cast, centered on your position, and doesn't require an enemy to be targeted to hit them. Once you see the enemy on your little enemy list (the one with the red circle, orange triangle, or yellow square), then switch to Succor spam.

Honestly, that's what I do a lot of the time. Sometimes I WHM it (Holy also doesn't require a target and is spamable, but Assize very much does work nicely because it has just a massive range so it's super easy to hit the boss SOMEhow even if you can't see it), but SCH/SGE's Art of War/Dyskrasia are nice since they're instant for those cases where marks are vaporizing fast.

If you have a max level tank, same situation, just you use Shield Lob/Tomahawk/Unmend/Lightning Shot if you can see it (your AOE if you can't - like all healers other than AST, all tanks have AOEs that don't require a target) until you get it on your agro list. With tank stance, you get full credit REALLY fast just by spamming the ranged attack because it does something like 10x enmity or similar ridiculousness. PLD can also spam Clemency on people, just make sure you're on the agro table before you start doing so.

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Hope that helps.