Honestly, the best way to learn to battle is to (you guessed it) BATTLE. It's not something we can type out for you. You just have to become more experienced by battling other trainers.
Assuming that you want to use these Pokemon in Single battles,
Nidoqueen, Flareon and Musharna fit best on Balanced offense teams from my experience. Balanced teams follow a formula of 1 Sweeper, 1-2 Wallbreakers, 1 Stallbreaker, 2-3 Walls/Pivots, 1 Hazard Setter and 1 Hazard Remover. The number variations of course imply that some Pokemon can fulfill more than one role
Nidoqueen works best as a special attacker because of Sheer Force and it's amazing coverage options. It has way more special moves that take advantage of the ability plus its special moves generally do more damage. It can be ran with either Life Orb (for a more offensive set) or Black Sludge (for a more defensive). Note that Sheer Force negates the damage taken from Life Orb. Generally you want to run Stealth Rock on all your sets. Outside of that you can run moves such as Sludge Wave, Earth Power, Toxic Spikes, Roar, Dragon Tail, Fire Blast, Thunderbolt, Ice Beam etc. The moves and held item you choose should take the other team members into consideration
Flareon works best with Choice Band or Toxic Orb in my opinion. Scarf is a waste because base 65 speed isn't going anywhere plus the previous two items allow Flareon to become a devastating wallbreaker which is what I feel it works best as. It can also run a Cleric set with Wish, Protect, Heal Bell and Lava Plume with max HP and SpDef with a Calm nature. Generally you'd be running Flare Blitz, Superpower, Double Edge (Facade if Toxic Orb) and Quick Attack on an offensive set
Musharna can be a good pivot and Calm Mind sweeper if played correctly. Not much to say here other than Calm Mind, Moonlight, Stored Power and Signal Beam.
Quick Edit :- Use the team building formula I posted here and test out other mons you'd feel comfortable using. Team building for others generally doesn't work out because not everyone can use every team or better yet not everyone would be comfortable with a team suggested for them
Assuming that you want to use these Pokemon in Single battles,
Nidoqueen, Flareon and Musharna fit best on Balanced offense teams from my experience. Balanced teams follow a formula of 1 Sweeper, 1-2 Wallbreakers, 1 Stallbreaker, 2-3 Walls/Pivots, 1 Hazard Setter and 1 Hazard Remover. The number variations of course imply that some Pokemon can fulfill more than one role
Nidoqueen works best as a special attacker because of Sheer Force and it's amazing coverage options. It has way more special moves that take advantage of the ability plus its special moves generally do more damage. It can be ran with either Life Orb (for a more offensive set) or Black Sludge (for a more defensive). Note that Sheer Force negates the damage taken from Life Orb. Generally you want to run Stealth Rock on all your sets. Outside of that you can run moves such as Sludge Wave, Earth Power, Toxic Spikes, Roar, Dragon Tail, Fire Blast, Thunderbolt, Ice Beam etc. The moves and held item you choose should take the other team members into consideration
Flareon works best with Choice Band or Toxic Orb in my opinion. Scarf is a waste because base 65 speed isn't going anywhere plus the previous two items allow Flareon to become a devastating wallbreaker which is what I feel it works best as. It can also run a Cleric set with Wish, Protect, Heal Bell and Lava Plume with max HP and SpDef with a Calm nature. Generally you'd be running Flare Blitz, Superpower, Double Edge (Facade if Toxic Orb) and Quick Attack on an offensive set
Musharna can be a good pivot and Calm Mind sweeper if played correctly. Not much to say here other than Calm Mind, Moonlight, Stored Power and Signal Beam.
Quick Edit :- Use the team building formula I posted here and test out other mons you'd feel comfortable using. Team building for others generally doesn't work out because not everyone can use every team or better yet not everyone would be comfortable with a team suggested for them
