Be careful with this. PSA has an exception that applies here. If the buyer purchased the card after the date that PSA deactivated the cert, the grade guarantee is void.
- the Guarantee does not apply to cards where the certification number has been deactivated by PSA before the most recent purchase of the Item;
Also, for some added discomfort, here are additional Grade Guarantee exceptions. I’ve included the ones especially relevant to Pokemon. 
the Guarantee does not apply to, and cannot be utilized by, the original submitter (or anyone acting on behalf of or for the benefit of the original submitter) of the Item. PSA reserves the right to investigate the relationship between the person making the PSA Guarantee request and the original submitter, including by way of performing a background check;
the Guarantee does not differentiate between the “Authentic” and “Authentic Altered” designations due to the fact that PSA does not always print the term “Altered” on the label itself for technical reasons (e.g., such as character and spacing limitations). Items labeled “Authentic” must be viewed as potentially interchangeable with “Authentic Altered,” and therefore equal in value and not subject to compensation through the guarantee policy.
the Guarantee does not apply to any Item as to which a clerical error has been made with respect to the assigned grade or description;
the Guarantee does not apply to any Item as to which a clerical or mechanical error (i.e., a typo or “mislabel”) has been made with respect to such Item’s specification, set, variation, or parallel;
the Guarantee does not apply to any Item that has been removed from the PSA holder either inadvertently or intentionally;
the Guarantee does not apply to any Item for which the PSA holder and/or label shows evidence of tampering or fraud;
the Guarantee does not apply to any Item for which there is evidence of rough handling, such as shaking or slamming, which can cause a discernible pattern of damage to certain cards;
the Guarantee does not apply to any Item that has been environmentally damaged due to improper storage or natural disasters, such as fire and water damage, or environmental deterioration (such as sunlight exposure or mold) subsequent to initial grading;
the Guarantee does not apply to manufacturer defects, including misprints;
the Guarantee does not apply to the authenticity or grade assigned to any autograph, whether certified by a manufacturer or applied after its release;
the Guarantee does not apply to the authenticity or grade assigned to sketch Cards or Comic or Magazine art;
the Guarantee does not apply to the authenticity or grade assigned to any unopened material, such as packs and boxes, nor is PSA responsible for any damage caused to a pack’s wrapper due to gum movement;
the Guarantee does not apply to any physical electronic media including, without limitation, video games, music recordings, television shows, or movies;
the Guarantee does not apply to lost, stolen, or damaged Items; it solely applies to questions regarding an Item’s authenticity or, solely in the case of Cards, their assigned grade; and