Hold Item suggestions?

Question

I'm always clueless, and terrible when it comes to deciding which items to give my Pokemon.
In a general sense, what kinds of items should l give which kinds of Pokemon?

If you could help me out here with which items to give my Pokemon:

• Adamant Metagross (252 ATK / 252 DEF / 6 SP DEF)
  - Meteor Mash
  - Agility
  - Explosion
  - Earthquake

• Jolly Mamoswine (252 SPEED / 252 ATK /6 SP DEF)
  - Earthquake
  - Ice Shard
  - Stealth Rock
  - Stone Edge

• Modest Zapdos (252 SP ATK / 252 SPEED / 6 DEF)
  - Thunder Wave
  - Thunderbolt
  - Roost
  - Heat Wave

e.g. Leftovers for Blissey because it will heal a lot and help stall better.

Thanks! ~

Comments

There are more, but l'm too embarassed to post any more... haha.

Answer 1

Your metagross being defensively built should have leftovers. Mamoswine is a sweeper so Life orb would be the best choice to boost Ice shard to be much more powerful. Zapados could use life orb or a berry to recover hp or boost a stat then heal with roost.