It is as Leon owns one in SwSh. Any dragon type 3rd stage that is owned by a champion gym leader is dubbed as a pseudo legendary.
A pseudo legendary pokemon is a fan term that commonly used to refer pokemon that has a three stage evolution line, 1250000 experience at level 100 and a base stat total of exactly 600 before mega evolving.
I've done some research. Haxorus' stat total was 540. And that was why Haxorus was not a pseudo legendary. A third-stage-dragon-type with a base stat total of 540 couldn't be a pseudo-legendary even Leon have it in his team.
The next room requires you to eat big smoke's order. You cannot shrink it pr have any special powers, the food is regular sized (like a chicken burger would be the same size as onemof those chicken sandwhiches you see a popeyes or Mcdonalds or something)you just have to eat it, just that. This is what big smoke's order is:
2 number 9s (2x soda,2x fries and 2xfried chicken burger)
a number 9 large (large soda and large fries with fried chciken burger witg 2 patties)
a number 6 with extra dip (soda, fries and chicken wings)
a number 7 (soda, fries and a chicken wrap)
1 number 45 (soda, fries and a grilled chicken burger)
1 number 45 with cheese (soda, fried and a grilled chicken burger with cheese)