I'm not new to pokémon but I can't say I'm a skilled player. But try to make sure your pokémon weakness are covered by another pokémon.
Try using this
site, it will show you your weakness and your counters. On the next page you can find your move coverage what is super convenient.
If I could give some tips:
You definitely need a fairy counter cause your Pancham has a 4x weakness for it:
Dragalge, Venusaur and Tentacruel will eat those special fairy attacks up. Play Rough though is common on Azumarill, Mawile(ubers) and saw it on Absol some times.
Talonflame doesn't like rocks or rock pokémon in general. Pancham can hit rock pokémon super effective and Tentacruel your counter for fairies can get rid of rocks with rapid spin and hit those rock pokémon with super effective moves.
Now an electric pokémon is pleased cause you have 2 pokémon weak to it Tentacruel can take a thunderbolt cause of it's special bulk. Maybe a ground pokémon that is resistant (volt switch) to it, will do the job.
Gliscor who can serve as your physical wall will do this job greatly. Be careful for Porygon-Z who often pack thunderbolt and ice beam. And you can switch in to Tentacruel who can eat water and ice moves. And switch in to Gliscor when you think Tentacruel is going to be hit by ground or electric moves.
You now have 2 physical attackers a special wall and physical wall, how about a special attacker?
Mega-Gardevoir has great coverage and some decent moves. And fits in your team cause of it's weakness is covered.
Or go for Mega-Venasaur who has excellent bulk and a good Sp.Atk stat.
Pangoro
Choice Band
Scrappy - Adamant
252 Atk / 4 Def / 252 Spe
- Knock Off
- Superpower
- Gunk Shot
- Ice Punch/ Parting Shot
Talonflame
Sharp Beak/Sky Plate
Gale Wings - Jolly
88 HP/252 Atk/168 Spe
-Swords Dance
-Flare Blitz
-Brave Bird
-Roost
Tentacruel
Black Sludge
Liquid Ooze - Calm
252 HP / 4 Def / 252 SpD
- Rapid Spin
- Toxic Spikes or Acid Spray
- Scald
- Sludge Bomb
Gliscor
Toxic Orb
Poison Heal - Impish
252 HP / 56 Def / 200 Spe
- Roost
- Fling
- Acrobatics
- Earthquake
or
Toxic Orb
Poison Heal - Impish
244 HP / 28 Def / 236 Spe
- Protect
- Taunt or Toxic
- Earthquake
- Substitute
Mega Gardevoir
Gardevoirite
Timid/Modest - Trace/Synchronize
4 HP / 252 SpA / 252 Spe
- Hyper Voice
- Psyshock
- Thunderbolt/Focus Blast
- Taunt/protect/destiny bond
or
Gardevoirite
Timid - Trace
24 Def / 232 SpA / 252 Spe
- Calm Mind
- Hyper Voice
- Psyshock
- Focus Blast / Thunderbolt
Mega Venusaur
Venusaurite
Modest - Chloropohyll
232 HP / 252 SpA / 4 SpD / 20 Spe
- Giga Drain
- Sludge Bomb
- Hidden Power Fire
- Synthesis/Leech Seed