Excluding 0%......Like with paralysis, confusion, infatuation......Not including does conditions which you have to get rid of before you can attack(Sleep, Freeze)
Paralysis = 25% chance to fail Infatuation = 50% chance to fail Confusion = 50% chance to fail Iron Head from Serene Grace Jirachi = 60% chance to fail Air Slash from Serene Grace Togekiss = 60% chance to fail
So Paralysis+Infatuation+Confusion+Serene Grace Flinch = 185% chance to fail However, they don't stack, the chances are calculated individually, so there is a very slim chance that a Pokemon could attack through all of that.
Paralysis: 75% to chance attack + Infatuation: 37.5% to attack + Confusion: 18.75% to attack + Serene Grace Flinch = 11.25% to attack all together
Sources: http://bulbapedia.bulbagarden.net/wiki/Paralysis_(status_condition) http://bulbapedia.bulbagarden.net/wiki/Infatuated#Infatuation http://bulbapedia.bulbagarden.net/wiki/Status_ailment#Confusion http://pokemondb.net/pokedex/jirachi http://pokemondb.net/pokedex/togekiss