No, it doesn't end the battle phase.
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You can activate any quick effect that can summon, during the battle phase. There are also many Triggered effects that would activate here too. But you cannot Normal Summon, or perform Special Summons that aren't resolvable effects, like Synchro Summons or Chaos Sorcerer.
Yes, as long as it's your own turn. If you want to activate them in the opponent's turn, you need to have Set them on the field during your own.
Quick Claw increases the possiblity of your Pokemon attacking first in battle.
First get 48 battle points on battle subway. You get 3 points for every 7 battles. Then go out of the train.You will see to men go to the one on the right. Scroll down until you see quick claw.
first off you have to change yugis team to that he has a harpie lady (doesn't matter which one) in the front of his party so that he walks with the harpie lady... then you have to take yugi with the harpie lady in front and quickly as soon as the battle starts bring him to the city that gets burned if you don't compleate it! so as long as you have the leader as a harpie and you do it quick you should be good