1: Can you use the Ambush Feat and Support if you meet the pre. for Ambush? Because it says on the Ambush Feat that when you make a close combat attack. Support gives you a Power Action to make a close combat attack.

2: You can't use the Haymaker feat and charge, can you?

3: Ok. Say I have Vet Legacy Batman and Vet Taskmaster on the same team. I put Ambush on Vet Taskmaster and someone bases Taskmaster. I use the Ambush feat and Taskmaster's stealth is countered until my next turn. Now since his stealth is countered, I can still Wildcard Batman TA, right? If so, that would be soo sweet.

1. No...it's not an actual cc attack, just treated like one. Read the description of Support in detail and you'll see what I'm talking about.

2. You can. Haymaker is a cc action, and Charge grants a free cc action.

3. Nothing to stop V Tasky from copying Bat Ally.

Charge grants a free action to make a close combat attack, not a close combat action though. Am I correct?

Nope:

CHARGE (optional): Give this character a power action. Reduce its speed value by half for the duration of the action. This character may move up to its replacement speed value and then be given one close combat action as a free action. A character with this power is not affected by Force Blast and does not suffer knockback.

As such, Charge can work with Exploit Weakness, B/C/F, Incap, etc. all of which are close combat actions.

You can Wildcard the Batman TA, yes... but Ambush requires the Stealth power. So, while Batman will keep Taskmaster (relatively) safe until the beginning of the next turn, if Taskmaster's actual Stealth power is somehow countered (by, say, Ult Cap on his second click with Outwit), the Batman TA will not meet the prerequisites for the feat. Tasky will be ambush-less.

Thanks guys! And can someone explain the reason ambush and support don't work, please?

Technically, they do work together (since during the Support power action, the character makes a close combat attack), but take a closer look at Support:

SUPPORT (optional): Give this character a power action. Make an attack roll against an adjacent target friendly character as though making a close combat attack. Neither character may be adjacent to an opposing character. Ignore all modifiers to combat values. If the attack roll is successful, roll one six-sided die. The target character is healed equal to the result.

Since Support ignores all modifiers, the +2 bonus from Ambush goes away and your character is left without its Stealth (since you did use Ambush). Better just to opt not to use Ambush.

Maybe just as well, it would create some bizarre situations if Dr Mid-Nite could do a surprise first aid on his friends...