LogFAQs > #922845362

1. Nah, no way of knowing. Recent trends would suggest less than 100, though.

2. Berries still exist, and they continually add new ones with new effects, though the methods for obtaining and growing them has changed from game to game. X/Y gave you a dedicated farm, S/M had your boxed Pokemon tending to them, B/W required a browser mini-game I think.

3. It's still the same concepts at it's core. Things are weak to things, things are strong against things, the usual. They actually made it easier in S/M by reminding you if a move is effective or not when fighting something you've already fought.

4. For whatever reason Game Freak doesn't like the idea of giving old Pokemon real evolutions in later games, so X/Y and OR/AS added temporary forms to various Pokemon that boosted stats and sometimes changed types. They haven't added any more new ones since. You can ignore them unless you plan to get into competitive battling.
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Change is weird.