3

For example

The thunderstone is a evolution-ing or evolv-ifying substance. It causes some thunder type pokemon to evolve.

  • 1
    "catalyst" doesn't mean causing evolution but may be useful. – Martin Smith Sep 11 '16 at 14:26
  • 2
    'Evolutionogenic' has been used. Once, apparently. – Edwin Ashworth Sep 11 '16 at 14:29
  • "Evolvogenic" (noun: "Evolvogen") could be a fitting neologism. – Quentin Sep 11 '16 at 16:52
4

The thunderstone is a mutagen and it's effects are mutagenic.

mutagen:

an agent (as a chemical or various radiations) that tends to increase the frequency or extent of mutation.

"Mutagen." Merriam-Webster.com. Merriam-Webster, n.d. Web. 11 Sept. 2016.

mutagenic:

: inducing or capable of inducing genetic mutation

"Mutagenic." Merriam-Webster.com. Merriam-Webster, n.d. Web. 11 Sept. 2016.

  • +1. For evolution in general, i.e., change, this is the right word. – Drew Sep 11 '16 at 17:27
3

Why not phylogenic? Oxford Dictionaries Online defines phylogenesis as

The evolutionary development and diversification of a species or group of organisms, or of a particular feature of an organism.

  • I don't know this word, but from the description it sounds like this refers to the evolution itself, i.e. the result rather than the cause the OP is looking for. – Mr Lister Sep 11 '16 at 20:42
  • @MrLister If you need more explicit causation, you could craft phylogenefactory or phylogenefacious. – bib Sep 11 '16 at 23:05
1

It's an evolution inducing substance. It induces the evolution.

induce to cause something to happen -Cambridge Dictionary

  • Welcome to English Language & Usage, a question and answer site for linguists, etymologists, and serious English language enthusiasts. Take the site tour or have a look at the help center to find out more about good answers. I edited your answer to have it use an actual link and to a format more commonly used when citing dictionaries. – Helmar Sep 11 '16 at 15:35

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