This symbol indicates how hard it is to find the card in booster packs
Queen Marchesa, Virtus the Veiled, Ramses, Assassin Lord, Etrata, Deadly Fugitive, and OIivia, Opulent Outlaw are all good examples among our roster of pre-existing professionals
The most valuable is Titania, but dont be misled by TCGplayers numbersCard Kingdom has 14 EX copies in stock at just $59.49

Sort Card Type Dark Ivysaur - 6 #6Promo $44.67 Dark Ivysaur - 6 [Winner] #6Promo $100.36 Erika's Ivysaur #41Uncommon $13.46 Ivysaur #30Uncommon $7.00 Ivysaur #30Uncommon $17.16 Ivysaur #44Uncommon $8.03 Ivysaur #5Promo $61.23 Ivysaur #47Uncommon $4.81 Ivysaur #82Uncommon $18.30 Ivysaur #35Uncommon $2.74 Ivysaur #7Uncommon $44.62 Ivysaur #14Common $12.39 Ivysaur #51Uncommon $1.78 Ivysaur #62Uncommon $4.14 Ivysaur #2Uncommon $9.86 Ivysaur #2Common $0.40 Ivysaur #2Uncommon $0.24 Ivysaur #2Classic Collection $7.01 Ivysaur #2Uncommon $0.39 Ivysaur #2None $0.88 Ivysaur #2Common $4.16 Ivysaur - 002/063 #2Common $0.18 Ivysaur - 002/132 #2Common $0.26 Ivysaur - 002/165 #2Uncommon $0.29 Ivysaur - 002/165 #2Uncommon $0.18 Ivysaur - 002/165 (Master Ball Pattern) #2Uncommon $12.55 Ivysaur - 002/165 (Poke Ball Pattern) #2Uncommon $1.61 Ivysaur - 034/100 #34Uncommon $17.61 Ivysaur - 035/100 #35Uncommon $4.00 Ivysaur - 065/063 #65Art Rare $6.85 Ivysaur - 134/132 #134Illustration Rare $20.55 Ivysaur - 167/165 #167Illustration Rare $45.49 Ivysaur - 167/165 #167Art Rare $14.38 Ivysaur - 35/100 (Prerelease) #35Promo $54.98 Ivysaur (Mirror Holofoil) #2None $5.32 Dark Ivysaur - 6 [Winner] #6Promo $100.36 Ivysaur #5Promo $61.23 Ivysaur - 35/100 (Prerelease) #35Promo $54.98 Ivysaur - 167/165 #167Illustration Rare $45.49 Dark Ivysaur - 6 #6Promo $44.67 Ivysaur #7Uncommon $44.62 Ivysaur - 134/132 #134Illustration Rare $20.55 Ivysaur #82Uncommon $18.30 Ivysaur - 034/100 #34Uncommon $17.61 Ivysaur #30Uncommon $17.16

The partner with mechanic is seen by some as a dumbed-down version of the original partner mechanic, but I dont think thats true
So, while you might not have the best cards, here are some tips to consider when choosing your cards