Description ID determines what message is displayed in a Pokémon's SUMMARY when the player looks at the move's Contest data (e.g. "A highly appealing move"). The actual message is stored in an array elsewhere and this ID is only used to address that array. It is also used to index the Contest data structure and determine this move's appeal and jam values (see Contest data structure in Generation III).
Contest Type indicates the type of Contest this move should be used in. See the table below for a list of possible values and their meaning.
Combo Identifier: An identifier used in the next 3 bytes for the purposes of identifying the first move in a Contest combination.
Combos: This is a list of up to three combo identifiers, identifying Contest combinations for which it may be used as the second move.
Padding consists of a sequence of 2 bytes. Each one of those bytes should be set to 0x00 (aligns the structure on 4-bytes boundaries).