I only usually make my pokemon hold items like quickclaw, leftovers, shellbell and other stuff like that. I do admit that berries can be pretty useful though.

i only make them hold a berry in the beginning of the game. other than that, i usually give them plates, quick claw, shell bell, and incenses.

sometimes yes...

Well, mostly at the start of any game, when my Pokémon need it to stay alive. But when my Pokémon reach Lv 30, I usually don't bother with it anymore. Then I mainly crush berries for PokéBlocks. I LOL everytime I see Norman's Slaking using a Sitrus Berry. xD

Yeah I watch the anime more then I play the games, so no I don't.

The berries don't help, I use leftovers and exp shares.

I mostly make them hold power boosting items. Sometimes berries.

Not all the time..unless I capture one already holding a certain berry...usually just give other them other things to hold like quick claws..or something depending on the type they are.

I usually give power and defence boosting items to my main team, like plates and other stuff like that, and then give something like an Exp Share or Lucky Egg to the Pokemon I'm training. I usually use berries like Chesto Berrie after a battle with the Elite Four (cause that's where I usually need them). Sometimes I use Sitrus berries too, though.