JY

This Special acts as an attack of a specified number and power type. The attack may not be affected by a card that has the word "teammate" on it, either as a defensive card play in response to the attack, after the attack has hit by a Special that would move or remove the hit, or by an Event card later in the battle that would move or remove the hit, or an Activator card that has the word teammate on it. Effects that shift the attack cannot affect this card if they have the word "teammate' in them in any manner.

Meta Rules
Meta #44 When a card specifies what cards may (or may not) be used to defend it, this includes ALL cards used in the defense.

Meta #58 Negates are considered a card being played defensively. If a Special indicates that it cannot be defended by a Special card, then a Negate cannot be used to defend the attack (although it may be used afterwards offensively to negate the effect). If a Special card indicates that it can only be defended by a specific type of card, then this excludes all other cards (including negates).

Meta #146 When a Special refers to what cannot affect it, it is referring to any cards which are in play already or cards which are playable by the defending player.