Sarah nodded to the first question. She glanced at the ranger, she didn't seem overly enthusiast or thrilled by this particular kind of league. Ofcourse, to each their own and Sarah was the last person to judge the likes or dislikes of others but to her a different kind of leagues she was used would be a challenge.  

"Doesn't matter wether it's the primary or secondary type. As long as one of the types are water, flying, ground or fire the pokemon is accepted into the league." She replied the easier question as she thought of a reply to the earlier statement.
 
"While the restriction poses a challenge as you have to really think about the pokemon you might encouter and which you can use, it doesn't limit yourself or your opponent that much. You have to have the right type, but nowhere is it said that you can only use type-specific attacks. If you taught your Mudbray rocksmash you might surprise an opponent with a flying type and a headbut or stomp always hits hard." 

While she was talking she was already thinking ahead to how her league might look. She brought herself to the present, up to now she only had one pokemon eligible. "Well perhaps not against ghosts" Sarah admitted with a smile, as the ranger had mentioned ghost trainers. She had to think of Litwick right away, a ghost-type that would qualify for the league.
"You still don't know if your opponent has only water types, or one or more of each type, or one flying and the rest fire. Or what they taught their pokemon. You have to think outside the box and be creative. Use the enviroment to your advantage." Sarah continue.

She thought a while about what was more challenging, being able to use all kind of pokemon and have no idea against what type you would find yourself at all or knowing it would be one of the four types, although not knowing for sure which you would find against you, but knowing your opponent knows what kind of types you have too and both wondering what the other had thought to make the most restriction and get the upperhand. Wether it was a powerful single type or a versitile dual-type.
"I think that within it's limitation, there is a wide range of options to get an advantage over your opponent." Sarah said with a nod.