Is using this Pokémon allowed for runs?

[hollowreboot]

So I have a question when it comes to Pokémon runs like the Mono type Challenge

 

Currently I am doing a Tri-Type run of Rejuvenation using only Poison, Ice, and Fairy Pokémon. 

But there is one Pokémon that I always questioned whether or not I wad allowed to use for this kinds of Challenges;

 

Can anyone who's doing a run of any type that's not Normal use Type:Null/Silvally because of them being able to change types via discs?

[ArcBolt27]

how mono runs typically work is if a mon doesnt start as a type specified in said run but evolves into such a type or changes into it via form change/held item its allowed (take eevee for example as despite being normal, it can fit on a mono team for any of its eeveelutions) the trick here is silvally would need to be using the poison/ice/fairy memory (it doesnt matter which) at all times after becoming silvally or else the run would effectively be invalidated, as for leading up to it becoming a silvally, it would usually be up to the one doing the run but i believe general consensus is it needs to leech exp via exp share/all or what have ye until evolution

[hollowreboot]

59 minutes ago, ArcBolt27 said:

how mono runs typically work is if a mon doesnt start as a type specified in said run but evolves into such a type or changes into it via form change/held item its allowed (take eevee for example as despite being normal, it can fit on a mono team for any of its eeveelutions) the trick here is silvally would need to be using the poison/ice/fairy memory (it doesnt matter which) at all times after becoming silvally or else the run would effectively be invalidated, as for leading up to it becoming a silvally, it would usually be up to the one doing the run but i believe general consensus is it needs to leech exp via exp share/all or what have ye until evolution

 

I see, well it is a good things that I am currently trying to get the EXP share (even though I am also trying to get the cards for the EV trainings) and in one of the quests not only do they give you a Type:Null but also the Poison memory...

Which Is neat

[dudeguyman]

It's a self-imposed challenge, you make the rules, but generally, multi-form mons are allowed in monotypes as long as you use the form of correct type (for example, if I was doing a mono Water, I could use Rotom-Wash, but not any other form of Rotom, and Type:Null is allowed only with the Water memory). For in-battle transformations, you can find much more divergence in the rules.