Block Attack is a Normal Spell Card. Normal Spell Cards can only be activated in your own turn, in main phase 1 or 2.
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yes
I don't see why not. Even though you can't attack on the first turn, that's not quite the same as saying monsters can't be given additional attacks. For example even if you use Gray Wing's effect on a different turn, you aren't obliged to use the additional attack if you don't want to. Gray Wing's effect is resolving to full effect, it just won't be able to do anything with it.
Dusknoir can learn Thunder Punch, which has a 10% chance of Paralyzing the opponent. If you do not have this move already, you can go to the Move Tutor in the Set Battle Team window to see if that move is available to learn.
first u can go to saffron city and catch snorelax
In this case, your opponent may not attack that turn.