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As mentioned, sometimes cards just arent included in pokemon-cards database for whatever reason, and if the first female Pikachu was on a jumbo, SOL because the site doesnt seem to ever include jumbos.
To add these cards in, some of the cuts I make are the dorky exalted creatures, mostly the otherwise vanilla two drops
Giant Cape: Increases a Pokmons HP, making them more durable
Other than that you can and should play more lands than normal (40+) so you can consistently hit every land drop - this will help to keep some ramp spells for after you played Omnath - because drawing lands isn't really that bad in any stage of the game anyway thanks to your commander