Oh, that's Steven Stone. Cool. Cool, now he can ask him about Lileep! "Mr Stone! I was wondering–do you think Lileep's always been rock and grass or do you think the fossilization reanimation process introduced the rock typing after the fact?" /crystaspen
This was exactly Steven's favourite type of question.
"It's a very interesting thing to think about, isn't it? And perhaps the same question could be put forward in regards to other fossil Pokemon too! Especially when it comes to Anorith, which also lived in water but lacks any official Water Type Classification.
When a Pokemon's Type is decided upon by Pokemon Professors and researchers, a number of factors have to be taken into consideration. Its' abilities, its' habitat, its' biology, its' diet, and so-on. Also, to prevent confusion, Pokemon Type Classification has been limited to Two Types. This is in order to not overcomplicate type classifiation and in order to be able to easily summarise a Pokemon's strengths and weaknesses.
Perhaps if Pokemon Type Classification allowed for up to three types to be allocated, then Lileep and Anorith would gain Water Typing.
However, since Anorith are in fact weak to Water Type attacks, it is possible that the revival process has effected their typing and brought out their rock type 'characteristics' so to speak further to the forefront. Anorith can still swim and live in water perfectly happily, but a forceful attack from a water move can inflict great damage.
I think as fossil revival technology continues to develop, we may be able to revive these Pokemon to yet truer versions of themselves. And perhaps then, their typing classifications may have to be altered!"