This is the boss weakness order of Mega Man 10, including the Wily Stage bosses. This is my preferred order:
Sheep Man = Mega Buster (Really easy boss, you don't need his weakness)
Pump Man = Thunder Wool (Sheep Man's Weapon, Hit with the electricity from the cloud for more damage)
Solar Man = Water Shield (Pump Man's Weapon)
Chill Man = Solar Blaze (Solar Man's Weapon)
Nitro Man = Chill Spike (Chill Man's Weapon, Make sure to hit Nitro with the spikes on the ground, not the shot going toward the ground)
Commando Man = Wheel Cutter (Nitro Man's Weapon)
Blade Man = Commando Bomb (Commando Man's Weapon, Use the explosion of the bomb to hit Blade, not the bomb itself)
Strike Man = Triple Blade (Blade Man's Weapon)
Now onto the Wily Stages!
Wily 1:
Weapon Archive Elec Man = Wheel Cutter
Weapon Archive Wood Man = Triple Blade
Weapon Archive Gemini Man = Wheel Cutter
Weapon Archive Ring Man = Solar Blaze
Weapon Archive Napalm Man = Rebound Striker (Strike Man's Weapon)
Weapon Archive Flame Man = Water Shield
Weapon Archive Slash Man = Chill Spike (Spikes on ground, not the shot going towards the ground)
Weapon Archive Frost Man = Commando Bomb (Explosion, not bomb)
Weapon Archive Tornado Man = Thunder Wool (Electricity, not the cloud)
Wily 2 Crab Puncher = Commando Bomb, Thunder Wool (Explosion and Electricity)
Wily 3 Block Devil = Rebound Striker
Wily 4:
Wily Machine 10 Phase 1 = Solar Blaze
Wily Machine 10 Phase 2 = Water Shield
Wily Capsule = Chill Spike (Use the shot this time, not the spikes on the ground)
For the 3 Mega Man Killers in the Special Stages, here are there weaknesses:
Enker = Mega Buster (Nothing else damages him)
Punk = Mirror Buster (Enker's Weapon)
Ballade = Screw Crusher (Punk's Weapon)
This is the boss weakness order of Mega Man 10, including the Wily Stage bosses. This is my preferred order:
Sheep Man = Mega Buster (Really easy boss, you don't need his weakness)
Pump Man = Thunder Wool (Sheep Man's Weapon, Hit with the electricity from the cloud for more damage)
Solar Man = Water Shield (Pump Man's Weapon)
Chill Man = Solar Blaze (Solar Man's Weapon)
Nitro Man = Chill Spike (Chill Man's Weapon, Make sure to hit Nitro with the spikes on the ground, not the shot going toward the ground)
Commando Man = Wheel Cutter (Nitro Man's Weapon)
Blade Man = Commando Bomb (Commando Man's Weapon, Use the explosion of the bomb to hit Blade, not the bomb itself)
Strike Man = Triple Blade (Blade Man's Weapon)
Now onto the Wily Stages!
Wily 1:
Weapon Archive Elec Man = Wheel Cutter
Weapon Archive Wood Man = Triple Blade
Weapon Archive Gemini Man = Wheel Cutter
Weapon Archive Ring Man = Solar Blaze
Weapon Archive Napalm Man = Rebound Striker (Strike Man's Weapon)
Weapon Archive Flame Man = Water Shield
Weapon Archive Slash Man = Chill Spike (Spikes on ground, not the shot going towards the ground)
Weapon Archive Frost Man = Commando Bomb (Explosion, not bomb)
Weapon Archive Tornado Man = Thunder Wool (Electricity, not the cloud)
Wily 2 Crab Puncher = Commando Bomb, Thunder Wool (Explosion and Electricity)
Wily 3 Block Devil = Rebound Striker
Wily 4:
Wily Machine 10 Phase 1 = Solar Blaze
Wily Machine 10 Phase 2 = Water Shield
Wily Capsule = Chill Spike (Use the shot this time, not the spikes on the ground)
For the 3 Mega Man Killers in the Special Stages, here are there weaknesses:
Enker = Mega Buster (Nothing else damages him)
Punk = Mirror Buster (Enker's Weapon)
Ballade = Screw Crusher (Punk's Weapon)