I can name a trainer who teaches the pill counter : Floyd Mayweather Sr., that is who taught me. He is almost as old school as it gets in the game.
It’s an extremely effective technique for me. The trick is to 1: not Telegraph it, and 2:manipulate the image of range
Of course speed plays a huge factor as well in terms of upper body movement & delivering the counter. If you’re opponent is in a normal stance, they cannot lean forward and deliver effective blows. If you can trick your opponent (by leaning forward into a stance where you cannot land effectiveness blows) into believing that you are within your normal punching range, and that they can hit you because of that, they will throw, come up short as you lean back, and pay for not realizing ur punching range was actually a few inches back. Bonus points if if they lean in or step into the shot because they are then colliding with ur punch.
If you are extremely fast with reflexes and hand speed, you can pull off the pull counter with ur opponent blatantly knowing ur going to pull counter ala Mayweather, with enough speed there is almost nothing you can do to prevent the pull counter from landing.
Feints would be the way to draw that one out. Or attempt to counter like Maidana