When it comes to his Pokémon AU, Tyson’s physical and verbal fighting style is the same as in any other universe, and - frankly - his Pokémon battling style is exactly what you would expect to come from Tyson.
No matter which universe he’s in, whether it’s magic duels in his Mythical!Verse/Hogwarts AU or fighting alongside his dæmon in HDM AU, Tyson has a style that he tends to lean towards. He has a lot of experience under his belt and Tyson tends to lean towards fighting in the middle to close range.
He favours knives over guns: to make it personal rather than something he can brush off, because there is more versatility in battle and outside of it, and because it’s quieter and more subtle with a surprising amount of speed behind it. Those choices carry over into the decisions he makes across all arenas of battle.
There are Pokémon that Tyson will have battle from long range, but for the most part, Tyson will focus on having his Pokémon in the middle ground, charging in for a point-blank attack, then darting away to relative safety; close enough to retreat or follow up with another attack.
Tyson likes to turn the odds in his favour and to use his environment to his advantage, such as Tyson’s use of staircases in his main!universe. To this end, Tyson has a lot of his Pokémon using weather moves and largely accurate moves. He makes sure the battlefield is on their side, or can easily be turned to disadvantage their opponent.
Though Status conditions may seem to play to Tyson’s general style, he doesn’t like to rely on something that may not take. He’s taken advantage of moves that have a chance to inflict conditions, but for the most part his team’s status moves are focused on weather or healing.
Tyson always like to have numbers on his side. He has a large pool of Pokémon to draw from and he’s trained them all to fight together. He’ll single battle if he must, but Tyson definitely favours having his team compliment each other in double or even triple battles.
Even in single battles, Tyson isn’t the type of trainer to have one Pokémon battle until they are spent. He likes to swap out his Pokémon constantly, to keep his opponent on their toes, and to take advantage of things set up by the last Pokémon. No matter the universe, Tyson likes to be flexible and adapt to the situation rather than try and force a solution to work.
He tends to favour two types of Pokémon overall: bulky, slower powerhouse Pokémon that can hold the line forever and take down an opponent with two or three powerful moves, & the other type is lightning-fast Pokémon who can finish the fight before its begun or simply keeping moving and never get hit.
Both styles play to a war of attrition, waiting for an opening to strike and making sure that when a move lands, maximum damage is achieved. That is exactly how Tyson likes to fight in person as well. He wants to wait for or create a golden opportunity, but failing that, Tyson is willing to wear down his opponent however he needs to.