Pokémon mystery dungeon

What lies inside part four

"Finally the fourth floor!" The group looked around at the lush greenery which seemed out of place in a desert.
"Ok let go!" Snow called and they followed. Soon they were at the end of the floor... the stairs.
The group must have been right because a Pokémon stepped out of the stairway... a lone Pokémon.
"Who are you!"
"I'm the dungeon boss."
"Aren't those near the end of the dungeon."
"Yes normally but this dungeon has several bosses."
"Aurgh!" The group sprung to attack the boss but he wasn't big enough for all of them to attack at once.
Soon the group got the boss weakened but he never seemed to faint.
"Ok three, two, one! Attack!" They all preformed one final attack on the boss causing him to faint.
They dragged the boss away from the staircase and went through. They were sad though to see the next floor was more of a desert.