| Mega Sableye & Tyranitar-GXUnified Minds · 226/236 | Unified Minds | 226/236 | Rare Ultra | $398.59 |
| Melmetal VPokémon GO · 075/078 | Pokémon GO | 075/078 | Rare Ultra | — |
| Meloetta-EXLegendary Treasures · RC25/RC25 | Legendary Treasures | RC25/RC25 | Rare Ultra | €26.68 |
| MelonyAstral Radiance Trainer Gallery · TG26/TG30 | Astral Radiance Trainer Gallery | TG26/TG30 | Rare Ultra | €3.86 |
| MelonyCrown Zenith Galarian Gallery · GG64/GG70 | Crown Zenith Galarian Gallery | GG64/GG70 | Rare Ultra | €5.87 |
| MelonyChilling Reign · 195/198 | Chilling Reign | 195/198 | Rare Ultra | €4.70 |
| Metagross-GXGuardians Rising · 139/145 | Guardians Rising | 139/145 | Rare Ultra | $15.01 |
| Metagross-GXGuardians Rising · 157a/145 | Guardians Rising | 157a/145 | Rare Ultra | — |
| Metagross VChilling Reign · 181/198 | Chilling Reign | 181/198 | Rare Ultra | €4.92 |
| Metal EnergyCrown Zenith · 159/159 | Crown Zenith | 159/159 | Rare Ultra | €2.97 |
| Mew-EXLegendary Treasures · RC24/RC25 | Legendary Treasures | RC24/RC25 | Rare Ultra | €159.69 |
| Mew-EXDragons Exalted · 120/124 | Dragons Exalted | 120/124 | Rare Ultra | $423.51 |
| MewtwoDetective Pikachu · 12/18 | Detective Pikachu | 12/18 | Rare Ultra | $10.85 |
| Mewtwo-EXNext Destinies · 98/99 | Next Destinies | 98/99 | Rare Ultra | $263.00 |
| Mewtwo-EXEvolutions · 103/108 | Evolutions | 103/108 | Rare Ultra | €39.68 |
| Mewtwo-EXBREAKthrough · 157/162 | BREAKthrough | 157/162 | Rare Ultra | €60.73 |
| Mewtwo-EXBREAKthrough · 158/162 | BREAKthrough | 158/162 | Rare Ultra | €71.75 |
| Mewtwo-GXShining Legends · 72/73 | Shining Legends | 72/73 | Rare Ultra | €24.56 |
| Mewtwo & Mew-GXUnified Minds · 222/236 | Unified Minds | 222/236 | Rare Ultra | $205.48 |
| Mewtwo VPokémon GO · 072/078 | Pokémon GO | 072/078 | Rare Ultra | — |
| Mew VFusion Strike · 250/264 | Fusion Strike | 250/264 | Rare Ultra | €22.83 |
| Mew VFusion Strike · 251/264 | Fusion Strike | 251/264 | Rare Ultra | $102.78 |
| M Gallade-EXRoaring Skies · 100/108 | Roaring Skies | 100/108 | Rare Ultra | €50.78 |
| M Gardevoir-EXGenerations · RC31/RC32 | Generations | RC31/RC32 | Rare Ultra | €69.03 |
| M Gardevoir-EXSteam Siege · 112/114 | Steam Siege | 112/114 | Rare Ultra | $57.78 |
| M Gardevoir-EXPrimal Clash · 156/160 | Primal Clash | 156/160 | Rare Ultra | $105.42 |
| M Glalie-EXBREAKthrough · 156/162 | BREAKthrough | 156/162 | Rare Ultra | $22.50 |
| M Gyarados-EXBREAKpoint · 115/122 | BREAKpoint | 115/122 | Rare Ultra | $125.14 |
| M Houndoom-EXBREAKthrough · 154/162 | BREAKthrough | 154/162 | Rare Ultra | €46.96 |
| MiloAstral Radiance Trainer Gallery · TG27/TG30 | Astral Radiance Trainer Gallery | TG27/TG30 | Rare Ultra | $2.71 |
| MiloRebel Clash · 190/192 | Rebel Clash | 190/192 | Rare Ultra | $3.65 |
| Milotic VRebel Clash · 179/192 | Rebel Clash | 179/192 | Rare Ultra | €12.19 |
| Mimikyu-GXLost Thunder · 206/214 | Lost Thunder | 206/214 | Rare Ultra | €51.25 |
| Mimikyu VBattle Styles · 148/163 | Battle Styles | 148/163 | Rare Ultra | €36.27 |
| MinaLost Thunder · 211/214 | Lost Thunder | 211/214 | Rare Ultra | €40.00 |
| Miss Fortune SistersLost Origin · 194/196 | Lost Origin | 194/196 | Rare Ultra | €3.03 |
| Misty's DeterminationEvolutions · 108/108 | Evolutions | 108/108 | Rare Ultra | €30.33 |
| Misty's FavorUnified Minds · 235/236 | Unified Minds | 235/236 | Rare Ultra | €135.81 |
| M Latios-EXRoaring Skies · 102/108 | Roaring Skies | 102/108 | Rare Ultra | €94.63 |
| M Lucario-EXFurious Fists · 55a/111 | Furious Fists | 55a/111 | Rare Ultra | $55.84 |
| M Manectric-EXPhantom Forces · 24a/119 | Phantom Forces | 24a/119 | Rare Ultra | €11.74 |
| M Mewtwo-EXBREAKthrough · 159/162 | BREAKthrough | 159/162 | Rare Ultra | $137.02 |
| M Mewtwo-EXBREAKthrough · 160/162 | BREAKthrough | 160/162 | Rare Ultra | €136.18 |
| MolayneUnbroken Bonds · 212/214 | Unbroken Bonds | 212/214 | Rare Ultra | $6.38 |
| Moltres & Zapdos & Articuno-GXHidden Fates · 66/68 | Hidden Fates | 66/68 | Rare Ultra | €31.77 |
| MorganTeam Up · 178/181 | Team Up | 178/181 | Rare Ultra | €34.50 |
| Morpeko VSword & Shield · 190/202 | Sword & Shield | 190/202 | Rare Ultra | €8.74 |
| MortyLost Thunder · 212/214 | Lost Thunder | 212/214 | Rare Ultra | €17.09 |
| M Pidgeot-EXEvolutions · 105/108 | Evolutions | 105/108 | Rare Ultra | $14.07 |
| M Rayquaza-EXRoaring Skies · 105/108 | Roaring Skies | 105/108 | Rare Ultra | €296.48 |