Sadly, you cannot duel Z-one nor is he mentioned in this game.
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There is no real hard limit - as long as you've got a spell card in hand, and a slot in the S/T zone for it to go, then you can activate it.
No, there isn't. Unless you count a Field Spell Card, which is a spell card but has its own zone, so technically you can have 6 spells active.
You can find pikachu all over the safari zone as i have caught one while cycling all over the safari zone you just have to look hard the level they are on is 25 or 27
Defence Mode, or Defence Position, means that the card is placed Horizontally in the monster zone. It could also be Set (face down defence position) or face-up due to being Set and attacked, or switched while face-up from attack to defence.
In Pokemon Leaf Green, the HM Strength is given to the player by the Game Warden of the Safari Zone. The player must first find the Warden's missing teeth in the Safari Zone and then he will hand over the HM.