"A Bisharp is always the leader of a pack of Pawniard, challenging another Bisharp to become the alpha of the pack. The loser, either the original pack leader or the newly evolved one, gets casted off. After a Bisharp becomes leader, it will closely monitor and inspect every Pawniard in its pack so that none of its Pawniard dare to betray it. Groups that are defeated in territorial disputes will be absorbed to the packs of the winning Bisharp. However no matter how strong a Bisharp is, it will have to forcibly retire if its head blade is chipped." - Pokémon Wiki on Bisharp.
I swear It randomly landed on Bisharp even after I did Kingambit.