move_meta_stat_changes does not include Shell Smash.

[jpirnat]

Shell Smash: Raises user's Attack, Special Attack, and Speed by two stages. Lower user's Defense and Special Defense by one stage.

Presumably because the data structure for moves in the games has room for only 3 modified stats per move, the move_meta_stat_changes table (which presumably was built just from the move data structure in the games) lacks the stat change data for the move Shell Smash.

Luckily, if Bulbapedia's Shell Smash trivia section is to be believed and extrapolated from, it is probably the only move whose stat change data is missing. ("Shell Smash is the only status move that will always affect more than three stats simultaneously.")

Anyway, here's what you need to add:

move_id,stat_id,change
504,2,2
504,3,-1
504,4,2
504,5,-1
504,6,2

[bluewave41]

Hi it's been 4 years. Why is shell smash still missing the effect entries...?