>>37274233I don't seem to be able to teach Dive.
From BC 01 to BF 01 are unused TMs with no description.
From C0 01 to 87 02 are gifts. First for each Pokémon (including unused gifts for evolutions), followed by type specific gifts, followed by the Premier Gift, followed by unused gifts with no description.
From 88 02 onwards are materials, which you can actually have in your regular inventory. You can place a material on the ground and pick it up. The item's menu has a "Send" option which crashes the game.