XYZ monster effects are exactly the same as regular monster effects - divided into Ignition, Trigger and Quick Effects. Quick Effects can be used during the Battle Phase.
Number 39 Utopia for example has a Quick Effect that is specifically used in the Battle Phase. If any other XYZ says it can be used in the opponent's turn, then more than likely it is a Quick Effect also and could be used during either Battle Phase. Giant Soldier of Steel is an example.
Brotherhood of the Fire Fist - Tiger King on the other hand has an effect that negates the effects of all face-up non-Beast Warrior monsters until the end of the opponent's turn. This is an Ignition Effect and can only be activated in your main phases, so could not be used in the battle phase, including yours.
Yes, it can be activated during your opponents battle phase.
The +200 ATK bonus is applied only 'during your battle phase', this is a continuous effect that does not use the chain. As soon as the battle phase ends, the +200ATK ceases to apply, but will be reapplied during your next battle phase. So say you have a monster with 1700 attack, it will ONLY have 1900 (+200) attack when you're in your battle phase and when you're back in your main phase 2 or end phase it goes back down to 1700 (-200). One thing to note is that you'll get the +200 attack during BOTH your own battle phase AND ALSO your opponent's battle phase.
It says on the card that it is used during the opponent's battle phase. Yes, it can be used in the same battle phase it is summoned in, there is no restriction against this.
You can activate Windstorm of Etaqua during the battle phase in Yu-Gi-Oh. The card, Windstorm of Etaqua can not be activated during the damage step or after using a monster to attack your opponent in the battle phase.
It's a Quickplay Spell card, so can be activated in your battle phase.
Yes, it can be activated during your opponents battle phase.
The +200 ATK bonus is applied only 'during your battle phase', this is a continuous effect that does not use the chain. As soon as the battle phase ends, the +200ATK ceases to apply, but will be reapplied during your next battle phase. So say you have a monster with 1700 attack, it will ONLY have 1900 (+200) attack when you're in your battle phase and when you're back in your main phase 2 or end phase it goes back down to 1700 (-200). One thing to note is that you'll get the +200 attack during BOTH your own battle phase AND ALSO your opponent's battle phase.
during the battle phase
during the initial phase
It says on the card that it is used during the opponent's battle phase. Yes, it can be used in the same battle phase it is summoned in, there is no restriction against this.
You can activate Windstorm of Etaqua during the battle phase in Yu-Gi-Oh. The card, Windstorm of Etaqua can not be activated during the damage step or after using a monster to attack your opponent in the battle phase.
Monsters can only 'manually' change battle position in your main phases. If you want to change them during the battle phase, you will have to do it by a card effect.
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It's a Quickplay Spell card, so can be activated in your battle phase.
Yes, you can.
Yes, because it is a quickplay and can be activated during the battle phase.