Then your Dragon Pulse misses and the Garchomp player recieved an undeserved win. This sort of thing happened where players would not miss just just once against Garchomp, some missed 3 attacks in a row against it. The problem many players had with it is that by rights, they had a game won, and then they would miss a crucial attack against Garchomp, and would lose the game, through no real fault of there own.
Isn't that just part of the game though? Say it comes down to 1v1, if your Terrakion hits your opponent's Dragonite with Stone Edge, you win. If you miss and Dragonite KOs you, did you still deserve to win? What is the criteria for "deserving to win" to begin with? To win with as little hax as possible, when that just as much an element of the game as anything else? Where do we draw the line?