Pikachu and Jigglypuff were chosen since they were voted as the most popular Pokemon in a CoroCoro survey
Dice-Rolling has returned in MTG Fallout, but not as a major mechanic
The main one being that if you have enough dark types for it (which you will if you're playing a dark type deck), you can use his ability to put 8 dark type Pokemon onto your bench, making for a whopping 9 Pokemon in play
You can build an Urtet deck in a myriad of ways, including artifacts (affinity, metalcraft), tokens, proliferate, or ramp
I can see the card advantage aspect of this, as youre essentially drawing up to four extra cards every time you attack with Pako, but Ive played the decks that draw excessively and they are just not for me