Look at these two cards, and belive it or not, they are very similar!

Name:        Scyther
Type:        Basic Pokemon
Card #:      card 10 of 64
Rarity:      Rare - Holo
Color:       Grass
HP:          70 HP
Weakness:    R      
Resistance:  F -30 
Retreat:     0
Pokemon #:   123
Species:     Mantis
Level:       25
Attack:      [G]  Swords Dance
             During your next turn, Scyther's Slash attack's base
             damage is 60 instead of 30.
Attack:      [3]  Slash  (30)



Koga's Ditto
Type:  Basic Psychic Pokemon
LV.12     HP 40
C:   Might
  Effect:  Flip a coin.  If heads, this Pokemon's maximum HP
    becomes 80.  (Benching this Pokemon ends this effect.)
C:   Tackle:   10
  Effect:  If this Pokemon is affected by "Might", this attack
    does 30 damage instead.
-C        Retreat
F         Weakness
P         Resistance (Damage -30)
No. 132 (Rare Hologram)


Rarity=same

Attack 1- both similar, but ditto's last longer, and effects the second
attack more, and increases Hp, though scythers does not reqiure a coin
flip-goes to ditty by a touch

Attack two-without attack 1, damage per energy is the same, but after their
first attacks, the dameage per energy is better with ditto. Look! 1 energy
does thirty damage! works until benched! Scyther does 60 for 3 energy every
other turn. If might works, then attack two goes to ditto, but other wise, it
really doesnt matter, but in truth, i'd rather have scyther if might did not
work.

HP-before might-scyther, after might-ditto still, ditto is much more
vunerable before might, so watch out. Average goes to scyther.

weak and resist-same

stage-same

retreat-scyther, which is very sad

Overall, I'd say that scyther is slightly better, because he has no retreat
or flipping ivolved, and better Hp overall, but he is not better by much!