It raises Defense by 10 EV (effort value) points
Simply battle with them and they will level up and become stronger. Or, every now and then you will find carbos, calcium, iron, ect. these can boost certain stats of you pokemon.
it boost up your supereffect moves
only deoxys
You get the Iron Tail TM by going up the waterfall in Meteor Falls and then going up a ladder.
Deoxys can learn Psycho Boost
Vegetables that are good sources of iron include spinach, kale, broccoli, and peas. Consuming these vegetables can help boost your iron levels and improve overall health.
If you want a good place to level up your pokemon, I highly recommend the Iron Island or the Fuego Ironworks.
Run alot with your Pokemon or use protein, iron, calcium, zinc, carbos and hp up on your Pokemon.
i went under ground and dug it up
No. A pokemon only has the xp boost when training with a trainer who didn't catch them. ie. On platinum, if you caught the pokemon it does not get xp boost. When you trade it over to silver, the silver trainer did not catch it so it gets xp boost. but when traded back to platinum, it is back with the trainer who caught it and therefore does not get xp boost.
I believe if the Pokemon holds it it boost the Dragon-Type moves.
When used on a pokemon it will boost its level and make it stronger.