First you need to have an event to show this animation on. Then call a code:
$game_map.events[event_id].animation_id = 3
Where 3 is the number of the animation and event_id is... you know what :]
You can replace the "$game_map.events[event_id]" expression with "get_character(id)" - it's the same.
All this can be done with event command.
And if you feel you MUST show the animation without any event, Trickster made a script for this (gotta search).