Ninetales just gives you much more consistency in attacking the pokemon you want to attack instead of just whatever your opponent brings up. It's only there for the Ability. And it's easier to search for.
The entire concept behind the deck is to score priority OHKOs, which most of the time will be Pokémon-EX. Pokémon-EX are worth two Prizes, so if at least two of your OHKOs are Pokémon-EX, you would still just need four copies of
Pokémon Catcher to do this.
If your opponent is not relying heavily onPokémon-EX, you can still trade single Prize Pokémon for single Prize Pokémon, and just need to strategically hit your opponent to reduce their own offensive capacity. Considering four
Pokémon Catcher allows you to do this up to four times, and in both this and the preceding scenario you are likely to hit at least one target without needing
Pokémon Catcher.
While some games you will need more than four copies of Pokémon Catcher, one has to consider how often this will happen, and what running a 2-2 Stage 1 line costs; running
Ninetales eats up four slots and reduces consistency for everything but having access to a pseudo-
Pokémon Catcher. It is easier to search out than
Pokémon Catcher but not than
Devolution Spray.
So your re-usable psuedo-
Pokémon Catcher is eating up seven slots! For the sake of argument, I will assume you are running no extra search for it, and merely multipurposing the same search you would use for
Raticate and that you simply don't search out
Vulpix or
Ninetales until you absolutely must to avoid running low on
Raticate supplies.
Seven slots allows for a fourth
Pokémon Catcher and maxing out
Skyla, and still has room for more draw power. Since there is a risk of multiple
Pokémon Catcher stuck in your Prizes, let's go with a
Town Map. We also have avoided giving an opponent access to more easy Prizes this way: most turns
Ninetales is only safe because your opponent
needs to take out
Raticate and force you to build another... but decks with spread (even if it is only to a single Benched Pokémon) haven't disappeared yet and wreak havoc with the
Devolution Spray strategy.
Now, I am all for finding a good use for
Raticate, so let me offer a suggestion that is probably necessary for your Skeleton list:
Ditto. A healing card (probably
Max Potion) is also needed. If
Ditto is OHKOed... so would the
Rattata. If
Ditto survives but is damaged, you can
Max Potion it since you probably have no Energy on it anyway, then Transform to
Rattata and Evolve to
Raticate (mentioned more for casual readers of the conversation - I know you already knew the combo). This would even behoove most of your other cards, since a
Ditto on the Bench is a good place holder for Evolutions.
I would also consider
Rescue Scarf with fewer
Raticate and
Rattata; lowers the risk of starting with an easily donked
Rattata, and
Tool Scrapper isn't often run in multiples so even if the first one is discarded, the others probably won't be. Do pack
Super Rod though just in case.