How to get Shards in Pokemon Emerald?

Question

So that I can trade them for elemental stones

Answer 1

Red Shard

Repeatable
- Wild Corsola (5% chance)

Non-repeatable
- Route 124 (Requires Dive, x2)
- Route 127 (Underwater, x2)

Blue Shard

Repeatable
- Wild Clamperl (5% chance)

Non-repeatable
- Route 124 (Requires Dive, x2)
- Route 126 (Underwater, x2)

Yellow Shard

Repeatable
- Wild Chinchou (5% chance)

Non-repeatable
- Route 124 (Requires Dive, x2)
- Route 126 (Underwater, x2)

Green Shard

Repeatable
- Wild Relicanth (5% chance)

Non-repeatable
- Route 124 (Underwater, x2)
- Route 126 (Requires Dive, x2)