Thoughts on how to improve my Mega Gardevoir deck?

Just started playing the TCG and honestly wanted to play a deck centered around Mega Gardevoir since she's my favorite mega.

Used this deck at my locals the other day and went 2-5. Any suggestions on what I can do to improve it?

Pokémon: 17

3 Mega Gardevoir ex MEG 60

3 Kirlia MEG 59

4 Ralts MEG 58

2 Mega Diancie ex PFL 41

1 Lillie's Clefairy ex ASC 76

1 Xerneas MEG 64

1 Sylveon PRE 40

2 Eevee PRE 74

Trainer: 30

1 Grand Tree SCR 136

2 Mystery Garden ASC 194

2 Rosa's Encouragement POR 84

1 Boss's Orders MEG 114

4 Lillie's Determination MEG 119

4 Wally's Compassion MEG 132

3 Mega Signal MEG 121

3 Wondrous Patch PFL 94

3 Rare Candy MEG 125

4 Poké Pad ASC 198

2 Switch MEG 130

1 Night Stretcher ASC 196

Energy: 13

3 Telepathic Psychic Energy POR 88

10 Psychic Energy SVE 5