Talonflame Mega Kangaskhan is the 13th most played Standard deck right now, at 1.9% of the field across 94 tournaments in the last 53 days. Its 463 tournament lists average a 47% win rate, and it has won at least one event in that time. 13 core cards show up in at least 70% of lists, including Boss's Orders, Latias ex and Ultra Ball. Among matchups with at least 30 games, its best is Mega Lucario Solrock (60.5% over 38 games) and its toughest is Dragapult Dudunsparce (37.6% over 85).
Appear in 70%+ of decklists, so they are near-essential for the archetype
Appear in 40% to 70% of decklists, so they are common but swappable
Win rates against other archetypes (min. 5 games)
Public decks built around this archetype