Rank	Sonia Pokémon Card	Price	Where to Buy?
1	Pokemon Card Japanese Marnie Sonia Sr And So On Girl Sets Plus Random	$1,668.35	eBay
2	PSA10 Pokemon Card Japanese Sonia 077/070 SR s1a Holo VMAX Rising [GEM MINT]	$1,138.49	eBay
3	Pokemon Card Japanese Sonia S1A 077/070 Sr Psa 10	$1,132.45	eBay
4	Pokemon Card Shop With Endorsement Complete Beauty Sonia SR J29-R121	$655.78	eBay
5	Pokemon Cards Sonia And May Sr	$596.70	eBay

ANALYSIS OF THE MOST VALUABLE SONIA POKÉMON CARDS

From our chart, we have the most valuable Sonia Pokémon Card priced at 1,668 dollars and 35 cents.

Additionally, we have an equally valuable Sonia card sold at a little over 600 dollars in fifth place.

Among the cards on the list, those in rank 2, 3, and 4 are all single Sonia Cards.

Alternatively, the first-ranked Sonia card is sold with other Pokémon cards, while the fifth-ranked card is sold as a Sonia and May two-card set.

Lastly, all the cards can be viewed and bought from eBay through their respective links.

Reference:

Top 5 Most Valuable Sonia Pokémon Cards