Tsukuyomi:
This card cannot be Special Summoned. This card returns to the owner's hand during the End Phase of the turn that it is Normal Summoned, Flip Summoned or flipped face-up. When this card is Normal Summoned, Flip Summoned, or flipped face-up, flip 1 face-up monster on the field into face-down Defense Position

If I attack Tsukuyomi "Flip Summoned" does it go to graveyard or card returns to the owner's hand during the End Phase of the turn that it is Normal Summoned, Flip Summoned or flipped face-up

Thank you

Im not sure on how you would attack Tsukuyomi "flip-summoned" thats a manual change either by you or your opp, if your opp "flipped summoned" it then it would be his/her turn (you couldn't attack it) if you flipped-summoned it and you attacked another face-up attack monster with Tsukuyomi and it got destroyed it would go to the grave, anyways that Tsuko gets destroyed it goes to the grave,............... hope this helps

Tsukuyomi is not "Flip summoned" when it is attacked, it is merely flipped face-up, which is one of the ways it needs to get its effect off.

First, if the monster attacking it is powerful enough, damage calculation would occur to see if Tsukuyomi lives or dies and, if the monster is stronger, Tsukuyomi will die, but since Tsukuyomi was flipped face-up, its effect will still be able to be used (but it is no longer on the field), so now you HAVE to flip a face-up monster into face-down DEF position (even if it's one of your own since the effect is NOT optional).

Since Tsukuyomi is destroyed and in the graveyard, it will NOT return to your hand.