Can an opponent react to Teemo Strategist moving to a battlefield by flipping him from Hidden during the showdown to trigger his ability twice (getting both the move trigger and the Hidden flip trigger)?

Ruling: You get one trigger or the other, not both. If Teemo moves to a battlefield and initiates a showdown, you can flip him from Hidden during that showdown, but you don't get both the move trigger and the Hidden flip trigger.

Nuances:

• Moving to a battlefield initiates a showdown
• During the showdown there will be an opportunity for reactions, including flipping up a Hidden Teemo
• The dev ruling clarifies this is mutually exclusive, not cumulative