I've decided to start posting Pok?mon card ideas for Misty here! These first four were done by somebody else, but they deserved to be posted anyway!
Misty's Swampert
110 HP {W}
Stage 2 Pok?mon (Evolves from Misty's Marshtomp)
{F} Mud-Slap 20
{W}{W}{W} Earthquake This attack does 10 damage to each of your own Benched Pok?mon. (Don't apply Weakness and Resistance for Benched Pok?mon.) 60
Weakness: {G}
Resistance: {L}
Retreat Cost: {C}{C}
Misty's Surskit
50 HP {W}
Basic Pok?mon
{W} Bubble Flip a coin. If heads, the Defending Pok?mon is now Paralyzed. 10
{G} Rapid Evolution Search your deck for a Stage 1 card named Misty's Masquerain and attach it to Misty's Surskit. (This counts as evolving Misty's Surskit.)
Weakness: {L}
Resistance: none
Retreat Cost: {C}
Misty's Sharpedo
80 HP {W}
Stage 1 Pok?mon (Evolves from Misty's Carvanha)
Pok?-BODY Dark Nature
If you have any {D} Energy cards attached to Misty's Sharpedo, you may treat Misty's Sharpedo as a {D} Pok?mon anytime except when applying Weakness for an attack.
{C}{C}{C}{C} Salvage Search Search your discard pile for any Pok?mon card with an attack. Choose any attack on the card you chose. Misty's Sharpedo copies that attack, including Energy costs and anything else required to use that attack (such as discarding Energy cards). (No matter what type the card you chose is, Misty's Sharpedo's type is still {W}.) Shuffle the card you chose back into your deck.
Weakness: {L}
Resistance: {P}
Retreat Cost: {C}
Misty's Milotic
100 HP {W}
Stage 1 Pok?mon (Evolves from Misty's Feebas)
{W} Water Gun This attack does 20 damage plus 20 damage for each {W} Energy card attached to Misty's Milotic but not used to pay for this attack's Energy cost. You can't add more than 40 damage in this way. 20+
{L}{L}{C} Thunder Flip a coin. If tails, Misty's Milotic does 30 damage to itself. 60
Weakness: {L}
Resistance: none
Retreat Cost: {C}{C}{C}
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These five are of my own creation. They're basically the rest of the lines of the four posted above.
Misty's Mudkip
Pok?mon card
{W}
50 HP
Basic Pok?mon
Weakness: {G}
Resistance: n/a
Retreat cost: {C}
{W} Bubble Flip a coin. If heads, the Defending Pok?mon is now Paralyzed. 10
{W}{C} Rock Smash 20
Misty's Marshtomp
Pok?mon card
{W}
80 HP
Stage 1 Pok?mon
Evolves from Misty's Mudkip
Put Misty's Marshtomp on the Basic Pok?mon
Weakness: {G}
Resistance: {L} -30
Retreat cost: {C}{C}
{W}{C} Ice Ball Flip 2 coins. This attack does 20 damage times the number of heads. 20x
{W}{W}{C} Mud Shot Flip a coin. If heads, the Defending Pok?mon can't attack during your opponent's next turn. 40
Misty's Carvanha
Pok?mon card
{W}
40 HP
Basic Pok?mon
Weakness: {L}
Resistance: n/a
Retreat cost: {C}
{C}{C} Bite 20
{W}{W} Chomp Away Flip 2 coins. This attack does 10 damage times the number of heads and for each heads, discard the top 2 cards of your opponent's deck. 10x
Misty's Feebas
Pok?mon card
{W}
30 HP
Basic Pok?mon
Weakness: {L}
Resistance: n/a
Retreat cost: {C}
{C} Splash 10
{C} Flail Does 10 damage times the number of damage counters on Misty's Feebas. 10x
Misty's Masquerain
Pok?mon card
{G}
70 HP
Stage 1 Pok?mon
Evolves from Misty's Surskit
Put Misty's Masquerain on the Basic Pok?mon
Weakness: {R}
Resistance: {F} -30
Retreat cost: n/a
{C}{C} Whirlwind If your opponent has any Benched Pok?mon, your opponent chooses 1 of them and switches it with the Defending Pok?mon. (Do the damage before switching the Pok?mon.) 20
{G}{G} Stun Spore Flip a coin. If heads, the Defending Pok?mon is now Paralyzed. 30