Evolution Items - can mostly be obtained from shops at /warp pokemart or /warp battletower.
Held Items - can be obtained from /warp pokemart, /warp battletower, winning a tournament (check /loot); berries can drop from breaking grass or leaves.
Megastones/Keystones - drop randomly from master loot after defeating a Purple Boss (check /loot) or can be obtained in tournaments; can also be purchased from our store (/store).
Fossils - can drop when mining normal stone. You can hatch them in /warp pokecenter at the Fossil Machine.
EV Related Items - usually obtained from /warp pokemart.
Nature/IV Capsules - these completely re-roll a Pokémon's nature or IVs. They can be obtained from the battle tower shop at /warp battletower
Mounts - can be crafted through /recipebook Mount
PC, Trade Machine, Healer, and Ranch - can be crafted through /recipebook [name] (e.g. /recipebook Healer)
Please note: most items can also be purchased through /gts