The wording of Shield Energy is now as follows, "This card can only be attached to {M} Pokémon. This card provides {M} Energy only while this card is attached to a {M} Pokémon. Any damage done to the {M} Pokémon this card is attached to by an opponent's attack is reduced by 10 (after applying Weakness and Resistance). (If this card is attached to anything other than a {M} Pokémon, discard this card.)". Damage should be reduced *after* applying Weakness and Resistance. Templating changed to reflect the reduction of damage being taken.
Source: TPCi Announcement (2015-04-24), TPCi Rules Team (2015-05-07)

Relevant cards

Note: All applicable cards may not be listed below.
XY5_143