The debug console.

Missing Resource Logger Enabled...
If a resource is missing it will be logged and replaced with an empty bitmap so that you may proceed.  After you have finished, check the 'Missing_Graphics.txt' and 'Missing_Sounds.txt' in your project to see what is missing that was expected.
This type of script will simply prevent un-needed crashes and put the exact name of files that need to be present when you release.
Checking for Actor Battlers script
Recognized: Yami Engine Symphony - Battle Symphony
Load: Self-Switch Reset v1.0 by Kread-EX
Processing: TM01
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Processing: HM01
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Entire Party Breaking Point is: 0

Attacker: Squirtle

Tackle: 50 => 50
   change: 150=>162
Actions:
Move: Tackle
Target: Charmander
Score: 162

Move: Tail Whip
Target: Charmander
Score: 50


Selection Complete:
Move: Tackle
Target: Charmander
Score: 162

Attacker: Squirtle

Tackle: 50 => 50
   change: 150=>162
Actions:
Move: Tackle
Target: Charmander
Score: 162

Move: Tail Whip
Target: Charmander
Score: 50


Selection Complete:
Move: Tackle
Target: Charmander
Score: 162

Attacker: Squirtle

Tackle: 50 => 50
   change: 150=>162
Actions:
Move: Tackle
Target: Charmander
Score: 162

Move: Tail Whip
Target: Charmander
Score: 50


Selection Complete:
Move: Tackle
Target: Charmander
Score: 162

Attacker: Squirtle

[Prefering damaging move]
Tackle: 50 => 50
   change: 225=>237
Actions:
Move: Tackle
Target: Charmander
Score: 237

Move: Tail Whip
Target: Charmander
Score: 50


Selection Complete:
Move: Tackle
Target: Charmander
Score: 237

Attacker: Squirtle

[Prefering damaging move]
Tackle: 50 => 50
   change: 225=>237
Actions:
Move: Tackle
Target: Charmander
Score: 237

Move: Tail Whip
Target: Charmander
Score: 50


Selection Complete:
Move: Tackle
Target: Charmander
Score: 237

Attacker: Squirtle

Tackle: 50 => 50
   change: 150=>162
Actions:
Move: Tackle
Target: Charmander
Score: 162

Move: Tail Whip
Target: Charmander
Score: 50


Selection Complete:
Move: Tackle
Target: Charmander
Score: 162
Item Effects:213:in `block in extra_evs': undefined method `extra_evs' for nil:NilClass (NoMethodError)
        from Item Effects:213:in `each'
        from Item Effects:213:in `inject'
        from Item Effects:213:in `extra_evs'
        from Pokémon Battle System:4355:in `block (3 levels) in process_action_end'
        from Pokémon Battle System:4344:in `each'
        from Pokémon Battle System:4344:in `block (2 levels) in process_action_end'
        from Pokémon Battle System:4330:in `each'
        from Pokémon Battle System:4330:in `block in process_action_end'
        from Pokémon Battle System:4324:in `each'
        from Pokémon Battle System:4324:in `process_action_end'
        from Mega Evolution:453:in `process_action'
        from Scene_Battle:48:in `update'
        from Pokedex:1746:in `update'
        from Party Dying Battle BGM:130:in `update'
        from Scene_Base:14:in `main'
        from MOG_Weather_EX:694:in `main'
        from Graphical Object Global Reference:201:in `main'
        from Video Player:153:in `run'
        from Map Screenshot:971:in `run'
        from Screenshot taker:215:in `run'
        from Main:10:in `block in <main>'