Helix Shard

The Helix Shard is a Shard obtained in Cerulean Cave (access is granted when you beat Kanto E4).100 Helix Shards can be used to revive an Omanyte. When defeating or catching Pokémon on F4 of Cerulean Cave, there is a rare chance of the Pokémon dropping a Helix Shard. Don't get too excited about getting a Helix Shard, since it will take you a long time to obtain 100 of them.