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You need to spam stallers cats to block Master A. and summon stronger and longer range cats. Strong and tanky units that do not get knocked back easily(such as Titan Cat), Cow Cat, or extremely long-ranged units are needed to take this enemy down (such as hacker cat or prisoner as a non-gacha alternative), otherwise you will either take forever or get out-stalled by other enemies. Bahamut's range is 1 point less than Master A, so he is a bad choice against this enemy, and he will most likely get knocked back before finishing his attack. Sometimes, however, you can get lucky and heavily damage Master A.
Valkryie Cat's True Form can help a lot; however if the Stopping Ability doesn't trigger, it might be a little bad. Awakened Bahamut is very effective against a single or close huddle of Master A's because of his quick movement speed being enough to dodge his attack and deal massive damage against it/them easily. Sanada Yukimura can also do the same act alongside Express Cat.